Solid iridociliary carcinoma in a dog

Background: Iridociliary epithelial tumors (ICETs) originate from the iris epithelium or ciliary body. They comprise ciliary body adenoma, carcinoma, pleomorphic adenocarcinomas, medulloepitheliomas, and other primitive neuroectodermal tumors. They are the second most common primary intraocular tumors in dogs and have already been reported in sheep and humans. In dogs, they occur more frequently in middle-aged to elderly animals, and the Labrador and Golden Retriever seem to be more predisposed breeds. This study aimed to describe the clinical and pathological aspects of solid iridociliary carcinoma in a dog. Case: A 3-year-old Poodle bitch was treated for discomfort in the left eyeball region, increased intraocular pressure and moderate buphthalmia. A direct ophthalmological examination was performed without equipment, and a mass was visualized in the posterior chamber, distorting the pupillary cleft. We opted for unilateral enucleation and forwarded the material for histological analysis. Macroscopically, the eyeball measured 3.4 cm (anteroposterior) x 2.6 cm (vertical), with a brownish mass that occupied the entire anterior chamber and part of the posterior chamber. Histologically, there was a neoformation in the ciliary body and iris pigment epithelium, partially well-delimited and densely cellular. The neoplasm was organized into predominantly solid formations interspersed with a discrete amount of blood vessels, rare bundles of fibrous stroma, and amorphous eosinophilic material forming membranes that were positive for PAS. Sections of the neoplasm were subjected to immunohistochemistry using anti-cytokeratin AE1/AE3, anti-S100 protein, anti-vimentin, and anti-Ki-67. Positive cytoplasmic immunostaining for cytokeratin and S-100 was observed. Only 45.6% of cells were positive for Ki-67 (500 cells). No immunostaining was observed for vimentin. Discussion: The diagnosis of solid iridociliary carcinoma was based on the histological features and positive immunostaining for cytokeratin AE1/AE3 and protein S100. Iridociliary carcinomas present positive immunostaining for cytokeratin, whereas adenomas and normal iridociliary epithelium do not present this immunostaining. Moreover, the high rate of cell proliferation was indicative of malignant neoplasia, as observed by the high mitotic count and high positivity for Ki-67. The S100 protein helped in the diagnosis of ICETs, as the iridociliary epithelium showed positive staining for this protein. Some histological features are important to consider in the diagnosis of iridociliary tumors in dogs, such as noninvasive growth in the posterior chamber, pigment epithelium, and thick homogeneous membranes on the cell surface. Furthermore, the presence of positive PAS membranes favors the diagnosis of iridociliary epithelial tumors. ICETs must be differentiated from melanocytomas, anterior uveal melanoma, medulloepitheliomas, and metastatic and pleomorphic carcinomas. The histological characteristics, especially the presence of PAS-positive membranes, associated with the immunohistochemical profile of neoplasm cells, help differentiate the ICETs from these tumors. In general, the prognosis is poor for eyeball and vision maintenance in canine iridociliary tumors, and scleral invasion is associated with a higher recurrence rate.

Canine mast cell tumour lomustine's sensitization by tyrosine kinase inhibitors

Background: Tyrosine kinase inhibitors (TKIs) may sensitize neoplasms to conventional antineoplastic agents, however such studies are scarse in the veterinary literature and there is no in vivo study about this subject. Although the literature recommend consensual about the use of masitinib for unresectable or metastatic MCTs, the potential of tumour sensitization to chemotherapeutic agents exerted by the drug is poorly explored in veterinary medicine. The objective of this paper was to report, for the first time, the sensitization of 2 canine mast cell tumours (MCTs) to lomustine, with the use of 2 tyrosine kinase inhibitors: masitinib and toceranib. Cases: Two dogs were referred due tumour recurrence in the left pelvic limb (dog 1), and unilateral mass in the right nasal mucocutaneous region (dog 2). The first case was a 8-year-old female Pinscher, and the second case refers to a 8-year-old male mixed-breed dog. Fine needle aspiration of both lesions was performed, and the cytological analysis were compatible with high grade canine MCT. In the first case, it was started a chemotherapeutic treatment with intravenous vinblastine (2 mg/m² ), associated with prednisolone (40 mg/m2 , every 24 h for 7 days), followed by 25 mg/m2 every 24 h, for more 30 days, tramadol (4 mg/kg every 8 h, until new recommendations) and gabapentin (3 mg/kg every 12 h, until new recommendations). However, there was no objective response, and vinblastine was substituted by lomustine (60 mg/m2 every 21 days), however there was also no response after 2 doses. After masitinib importation, the same was started at 12.5 mg/kg orally every 24 h, but there was also no objective response. However, after new lomustine administration the lesion showed complete remission. The second dog initiated its treatment with toceranib, recently licensed in Brazil, at a dosage of 2.7 mg/kg every 48 h, and after 30 days, there was partial remission. However, the remaining lesion still deemed unresectable, and systemic chemotherapy with lomustine (50 mg/m2 ) was initiated along with continuous toceranib. After 3 weeks of the first chemotherapy complete remission was noted and a second dose was administered. Once the patient remained in complete clinical remission, only toceranib was maintained at the same dose. After 11 months using the toceranib, there was sign of disease recurrence and lomustine was re-initiated resulting in complete remission. Discussion: The TKIs masitinib and toceranib might be considered the first-line therapy for unresectable and/or metastatic canine MCT, but also for those cases with confirmed internal tandem duplications in the exon 11 of the c-KIT protooncogene. Masitinib appears to be more selective than others TKI, such as toceranib, imatinib, dasatinib and sunitinib, because it causes weak inhibition of BCR/ABL (breakpoint cluster region-Abelson), Fms (macrophage colony-stimulating factor receptor), Flt-3 (FMS-like tyrosine kinase-3) and VEGFR (vascular endothelial growth factor receptor), which may partially explains its increased safety and lower risk of cardiotoxicity. In the first case, the animal has been treated with lomustine associated to masitinib and showed a progression-free interval of 33 days, however, the response reported may have been lower, due previously exposition to chemotherapeutic agents, which might compromise the response to TKI. The second case, with the association of lomustine and toceranib, was followed up for 365 days, presenting only one recurrence in the final third of the follow-up, however, with subsequent new complete remission. Sensitization of canine MCT to lomustine with TKIs increases the therapeutic possibilities for this neoplasm, mainly in patients with advanced stage and high-grade tumours.

Canine facial eosinophilic furunculosis in a dog

Canine facial eosinophilic furunculosis (FEF) is a hyperacute dermatopathy especially of the nasal bridge of dogs and is probably associated with type I hypersensitivity secondary to arthropod bites. The aim of this study is to report on a FEF case in a four-year-old female free-roaming mixed-breed dog showing papules on the nasal bridge that evolved to an ulcerated plaque. No other clinical, hematological, or biochemical alterations were detected. Cytology revealed eosinophilic and neutrophilic inflammation associated with bacterial infection. Punch biopsies were obtained for histopathological and microbiological analysis. Histopathology revealed marked, acute, multifocal to coalescent granulomatous eosinophilic furunculosis, and mild, acute, multifocal eosinophilic folliculitis. Microbiology revealed growth of coagulase-positive Staphylococcus sp. Clinical and histopathological findings were suggestive of facial eosinophilic folliculitis and furunculosis. Complete remission of the lesions was obtained after treatment. This condition is hyperacute, progressive, with a papular and erosive to ulcerative pattern, good prognosis, and its development is linked to arthropod bites. Furthermore, anti-inflammatory therapy is effective in treating the disease.(AU)

Correlation of Clinical, Histopathological and Histomorphometric Features of Canine Soft Tissue Sarcomas

Sarcomas de partes moles (STS) representam um grupo heterogêneo de tumores com características histológicas e comportamento biológico semelhantes. Este estudo teve como objetivo descrever a correlação entre as características clínicas, histopatológicas e histomorfométricas do STS em cães. Os registros médicos foram revisados ​​para identificar todos os cães nos quais um STS foi diagnosticado entre 2006-2017. Trinta casos foram incluídos, e amostras de tumor e prontuários médicos foram recuperados. A maioria dos cães era mestiça (40%) e 80% dos STS localizavam-se no tecido conjuntivo subcutâneo. A classificação histopatológica mostrou que sarcoma indiferenciado (17%) e tumor de bainha de nervo periférico (30%) foram os STS mais comuns. O STS de grau I foi obtido em 50% dos casos (15/30), e os tumores de grau II ou III comprometeram 43% (13/30) e 7% (2/30), respectivamente. O índice mitótico variou de zero a 26 (5,8 ± 7,5). A razão núcleo: citoplasma aumentada foi moderadamente associada com maior grau de tumor (p = 0,05; rS = 0,361) e índice mitótico (p = 0,05; rS = 0,355), enquanto o número de microvasos foi positivamente correlacionado com o grau de diferenciação (p = 0,05 ; rS = 0,362) e pleomorfismo nuclear (p = 0,036; rS = 0,384). A histomorfometria mostrou-se útil na avaliação do STS, representando uma ferramenta adicional correlacionada a fatores prognósticos bem estabelecidos (grau histopatológico, grau de diferenciação, pleomorfismo nuclear). enquanto o número de microvasos foi positivamente correlacionado com o grau de diferenciação (p = 0,05; rS = 0,362) e pleomorfismo nuclear (p = 0,036; rS = 0,384). A histomorfometria mostrou-se útil na avaliação do STS, representando uma ferramenta adicional correlacionada a fatores prognósticos bem estabelecidos (grau histopatológico, grau de diferenciação, pleomorfismo nuclear). enquanto o número de microvasos foi positivamente correlacionado com o grau de diferenciação (p = 0,05; rS = 0,362) e pleomorfismo nuclear (p = 0,036; rS = 0,384). A histomorfometria mostrou-se útil na avaliação do STS, representando uma ferramenta adicional correlacionada a fatores prognósticos bem estabelecidos (grau histopatológico, grau de diferenciação, pleomorfismo nuclear).

Correlation of Clinical, Histopathological and Histomorphometric Features of Canine Soft Tissue Sarcomas

Sarcomas de partes moles (STS) representam um grupo heterogêneo de tumores com características histológicas e comportamento biológico semelhantes. Este estudo teve como objetivo descrever a correlação entre as características clínicas, histopatológicas e histomorfométricas do STS em cães. Os registros médicos foram revisados ​​para identificar todos os cães nos quais um STS foi diagnosticado entre 2006-2017. Trinta casos foram incluídos, e amostras de tumor e prontuários médicos foram recuperados. A maioria dos cães era mestiça (40%) e 80% dos STS localizavam-se no tecido conjuntivo subcutâneo. A classificação histopatológica mostrou que sarcoma indiferenciado (17%) e tumor de bainha de nervo periférico (30%) foram os STS mais comuns. O STS de grau I foi obtido em 50% dos casos (15/30), e os tumores de grau II ou III comprometeram 43% (13/30) e 7% (2/30), respectivamente. O índice mitótico variou de zero a 26 (5,8 ± 7,5). A razão núcleo: citoplasma aumentada foi moderadamente associada com maior grau de tumor (p = 0,05; rS = 0,361) e índice mitótico (p = 0,05; rS = 0,355), enquanto o número de microvasos foi positivamente correlacionado com o grau de diferenciação (p = 0,05 ; rS = 0,362) e pleomorfismo nuclear (p = 0,036; rS = 0,384). A histomorfometria mostrou-se útil na avaliação do STS, representando uma ferramenta adicional correlacionada a fatores prognósticos bem estabelecidos (grau histopatológico, grau de diferenciação, pleomorfismo nuclear). enquanto o número de microvasos foi positivamente correlacionado com o grau de diferenciação (p = 0,05; rS = 0,362) e pleomorfismo nuclear (p = 0,036; rS = 0,384). A histomorfometria mostrou-se útil na avaliação do STS, representando uma ferramenta adicional correlacionada a fatores prognósticos bem estabelecidos (grau histopatológico, grau de diferenciação, pleomorfismo nuclear). enquanto o número de microvasos foi positivamente correlacionado com o grau de diferenciação (p = 0,05; rS = 0,362) e pleomorfismo nuclear (p = 0,036; rS = 0,384). A histomorfometria mostrou-se útil na avaliação do STS, representando uma ferramenta adicional correlacionada a fatores prognósticos bem estabelecidos (grau histopatológico, grau de diferenciação, pleomorfismo nuclear).(AU)

Abortion in captive gray brocket deer (Mazama gouazoubira) associated with colloid goiter, hemonchosis and necrotizing rumenitis

Background: The gray brocket deer (Mazama gouazoubira) is a specie that shows great adaptability in different habitats and it is the most abundant deer specie in South America. The present work describes for the first time a case of abortion followed by death associated with colloid goiter, massive hemonchosis and necrotizing rumenitis in a captive female gray brocket deer. Case: A 4-year-old female gray brocket deer (M. gouazoubira) raised in captivity had a history of abortion during the last third of gestation. The animal was kept in an enclosure together with 3 other gray brockets deers, being 1 male of the same age and 2 juvenile brocket deer of approximately 1 and 2 years old. The animals were fed with concentrated used as cattle feed and dewormed annually with 1% Ivermectin. The animals' enclosure had vegetation cover formed by grasses and soil. The animals appeared healthy with no behavioral changes. The day after the stillbirth, the mother was found dead in the enclosure and sent to the animal pathology sector of the University of Vila Velha (UVV), Brazil. Necropsy revealed that thyroid lobules were highly increased in volume and histopathological findings were compatible with colloid goiter. A large number of nematodes were found in the abomasal content, totalizing 11,626 helminths, which were morphologically characterized as Haemonchus contortus. Grossly, the serous and ruminal mucosa exhibited an extensively reddish focal area with irregular contour, surface ulceration and a firm consistency. Microscopically, a severe necrotizing rumenitis was diagnosed. The liver showed pale multifocal areas on the subcapsular surface, friable to the touch which deepened when cut. Histopathological analysis revealed an accentuated multifocal panlobular coagulative necrosis, characterizing an acute liver necrosis. Discussion: Iodine is a mineral of great importance for thyroid hormones synthesis and your requirements are higher during pregnancy and lactation. Diets deficient in iodine causes a reduction in the basal activity of the hormones triiodothyronine (T3) and thyroxine (T4) and over-stimulation of the thyroid by thyroid stimulating hormone (TSH), resulting in goiter. In the present case, it is possible that the shortage of iodine in diet caused a goiter and, as a consequence, triggered the abortion. Haemonchus contortus is a pathogenic nematode of small ruminants, leading to decreased productivity and death in some cases as a result of anemia and hypoxia. The contact between domestic and wild animals, resulting in the emergence of infectious diseases and the spread of pathogens among species. In the present case, manual counting accounted for 11,626 H. contortus larvae, characterizing a massive infection and justifying the condition of severe anemia. The high parasitic load shown in this case points out this parasite's importance related to this species in captivity. In general, inflammatory lesions in the rumen are results of excessive intake of fermentable carbohydrates, which leads to a considerable decrease in ruminal pH and leads to a high proliferation of lactic acid bacteria. This lesion has been previously reported in cervids. This case of comorbidities demonstrates that failures in nutritional and health handling, may cause simultaneous multiple diseases leading to death. Preventive measures for helminth parasite control and a proper feeding management with an adequate diet must be provided in order to preserve the species in captivity.

Clinical, cytological, histopathological and immunohistochemical features of a T-Zone lymphoma in a mixed-breed dog

Background: Non-Hodgkin lymphoma are a group of lymphoid neoplasms originating from the proliferation of precursors or mature, T, B and/or NK lymphocytes. T-Zone lymphoma (TZL) is characterized as an indolent lymphoma due to its slow progression and poor chemotherapy’s response. Dogs affected by this neoplasm may live for many years without clinical signs and are often underdiagnosed. The aim of this study was to report a TZL case in a 9-year-old male mixed breed dog, submitted to clinical follow-up and chemotherapy. Case: A 9-year-old male mixed-breed dog was presented due to the observation of an increased left mandibular lymph node. The previous cytological examination was suggestive of reactive hyperplasia and histopathological examination, by incisional biopsy, compatible with lymphocytic low-grade lymphoma. Physical examination revealed enlarged and firm left mandibular lymph node and adequate physical condition. A cytological examination was performed on the mandibular and both popliteal lymph nodes and revealed many small lymphocytes with hyperchromatic chromatin, rarely evident nucleolus and whose cytoplasm often projected in the form of a “hand-mirror” or “comet tail”, compatible with lymphocytic lymphoma (low grade) and suggestive of TZL, in the three assessed lymph nodes. The histopathological and immunohistochemical examination, of the mandibular lymph node were chosen to confirm the diagnosis. In histopathology it was observed that 40% of the sample contained a monotonous cell population, composed by small lymphocytes, with some presenting “hand-mirror” morphology. Two mitotic figures were evidenced per field of high magnification (40x), inferring a low-grade disease. Immunohistochemical analysis revealed neoplastic proliferation with immunolabeling of CD3 lymphocytes and positivity for Ki-67 in 48% of neoplastic cells, but negative for CD20, CD79a, CD45, MUM-1 and...

Clinical, cytological, histopathological and immunohistochemical features of a T-Zone lymphoma in a mixed-breed dog

Background: Non-Hodgkin lymphoma are a group of lymphoid neoplasms originating from the proliferation of precursors or mature, T, B and/or NK lymphocytes. T-Zone lymphoma (TZL) is characterized as an indolent lymphoma due to its slow progression and poor chemotherapys response. Dogs affected by this neoplasm may live for many years without clinical signs and are often underdiagnosed. The aim of this study was to report a TZL case in a 9-year-old male mixed breed dog, submitted to clinical follow-up and chemotherapy. Case: A 9-year-old male mixed-breed dog was presented due to the observation of an increased left mandibular lymph node. The previous cytological examination was suggestive of reactive hyperplasia and histopathological examination, by incisional biopsy, compatible with lymphocytic low-grade lymphoma. Physical examination revealed enlarged and firm left mandibular lymph node and adequate physical condition. A cytological examination was performed on the mandibular and both popliteal lymph nodes and revealed many small lymphocytes with hyperchromatic chromatin, rarely evident nucleolus and whose cytoplasm often projected in the form of a “hand-mirror” or “comet tail”, compatible with lymphocytic lymphoma (low grade) and suggestive of TZL, in the three assessed lymph nodes. The histopathological and immunohistochemical examination, of the mandibular lymph node were chosen to confirm the diagnosis. In histopathology it was observed that 40% of the sample contained a monotonous cell population, composed by small lymphocytes, with some presenting “hand-mirror” morphology. Two mitotic figures were evidenced per field of high magnification (40x), inferring a low-grade disease. Immunohistochemical analysis revealed neoplastic proliferation with immunolabeling of CD3 lymphocytes and positivity for Ki-67 in 48% of neoplastic cells, but negative for CD20, CD79a, CD45, MUM-1 and...(AU)

Correlação citológica e histopatológica do osteossarcoma rico em células gigantes em felino / Cytological and histopathological correlation of feline giant cell-rich osteosarcoma

Background: Primary bone tumours are uncommon and poorly reported in cats but osteosarcoma (OSA) is the most frequent, mostly inelderly animals. Giant cell-rich OSA is considered rare in the literature representing 3% of all OSA in humans. The mitotic index seemsto have a significant effect on the survival time of cats affected by OSA as well as the tumour histopathological grade. The objective ofthis study was to report the cytological and histopathological findings of a giant cell rich OSA in a 4-year-old cat with persistent felineleukaemia virus (FeLV) antigenaemia.Case: A 4-year-old male neutered cat was referred with a history of persistent FeLV viraemia and pelvic limb lameness with a firmswelling. Previous radiographs of the affected limb revealed bone lysis in the third and fourth metatarsals and increased soft tissueradiopacity in the tarsal region. The referral veterinary assumed it to be osteomyelitis and initiated clinical treatment with antibiotic andanti-inflammatory. The cat was referred after there was no response to medical treatment. The cat was presented with a 5cm diameterulcerated mass, with putrid odor in the pelvic limb. Complementary exams were performed, and abnormalities were found, includingincreased urea, creatinine, calcium and potassium, and decreased sodium and phosphorus. A new radiograph showed exuberant boneproliferation, with increased radiopacity involving tarsal, metatarsal, distal third of tarsal I and II, and distal diaphysis of metatarsal V,without compromising the metaphyseal region of distal diaphysis of metatarsal IV. Chest radiographs and abdominal ultrasound wereunremarkable. Fine-needle aspiration was performed for cytological analysis and revealed a moderate amount of pleomorphic mesenchymal cells with moderate adhesion, cytoplasm with a format ranging from fusiform to stellate, pronounced...(AU)

Correlação citológica e histopatológica do osteossarcoma rico em células gigantes em felino / Cytological and histopathological correlation of feline giant cell-rich osteosarcoma

Background: Primary bone tumours are uncommon and poorly reported in cats but osteosarcoma (OSA) is the most frequent, mostly inelderly animals. Giant cell-rich OSA is considered rare in the literature representing 3% of all OSA in humans. The mitotic index seemsto have a significant effect on the survival time of cats affected by OSA as well as the tumour histopathological grade. The objective ofthis study was to report the cytological and histopathological findings of a giant cell rich OSA in a 4-year-old cat with persistent felineleukaemia virus (FeLV) antigenaemia.Case: A 4-year-old male neutered cat was referred with a history of persistent FeLV viraemia and pelvic limb lameness with a firmswelling. Previous radiographs of the affected limb revealed bone lysis in the third and fourth metatarsals and increased soft tissueradiopacity in the tarsal region. The referral veterinary assumed it to be osteomyelitis and initiated clinical treatment with antibiotic andanti-inflammatory. The cat was referred after there was no response to medical treatment. The cat was presented with a 5cm diameterulcerated mass, with putrid odor in the pelvic limb. Complementary exams were performed, and abnormalities were found, includingincreased urea, creatinine, calcium and potassium, and decreased sodium and phosphorus. A new radiograph showed exuberant boneproliferation, with increased radiopacity involving tarsal, metatarsal, distal third of tarsal I and II, and distal diaphysis of metatarsal V,without compromising the metaphyseal region of distal diaphysis of metatarsal IV. Chest radiographs and abdominal ultrasound wereunremarkable. Fine-needle aspiration was performed for cytological analysis and revealed a moderate amount of pleomorphic mesenchymal cells with moderate adhesion, cytoplasm with a format ranging from fusiform to stellate, pronounced...

Equine heterotopic polyodontia: a case report / Poliodontia heterotópica equina: relato de caso / Poliodontia heterotópica equina: relato de caso

Heterotopic polyodontia have been described in most domestic species. Known as a dentigerous cyst but appropriately called heterotopic polyiodontics, it rarely occurs in horses, however it is easily recognized as a congenital defect. The cysts usually associated with this condition contain part or all of dental structures. The heterotopic tooth or dental structure is usually adhered to the temporal bone and surrounded by a secretory membrane, with a accumulation of exudate and draining tract along the proximal pinna or directly over the cyst. This case report describes in a 2.5-year-old female quarter horse, weighing 430 kg, with a heterotopic polyodontia that contained two easily small's identifiable dental structures, presented for evaluation of a chronic intermittent mucopurulent exudate discharge from the right sub-auricular region in the mastoid process of the temporal bone and a drainage tract near the right pinna. The diagnosis is established with clinical, radiographic, ultrasound and confirmed by histopathological examination of the structures removed. The cystic capsule was surgically removed, measuring approximately 3.0 x 2.3 cm in diameter, filled with mucopurulent exudate and containing two dental structures within 0.5 cm in diameter and 0.2 cm in diameter. Microscopic examination revealed a cystic area covered by stratified squamous epithelium with a lympho-histio-plasmatic cell infiltrate in the dermis, which was compatible with heterotopic polyodontia. Postoperatively, there were no neuromotor sequelae and wound healing evolved positively.(AU)

A poliodontia heterotópica tem sido descrita na maioria das espécies domésticas. Conhecido como cisto dentígero, mas apropriadamente denominado poliodontia heterotópica, raramente ocorre em equinos, porém é facilmente reconhecido como defeito congênito. Os cistos geralmente associados a essa condição contêm parte ou toda as estruturas dentarias. O dente heterotópico ou estrutura dentaria é comumente encontrado aderido ao osso temporal e envolvido por uma membrana secretora, com acúmulo de exsudato e trajeto de drenagem ao longo do pavilhão auricular proximal ou diretamente sobre o cisto. Este relato descreve um caso de em um equino,fêmea, quarto de milha, com 2,5 anos de idade, pesando 430 kg, com poliodontia heterotópica que continha duas estruturas dentarias facilmente indentificadas, apresentando um orifício na região sub-auricular direita no processo mastóideo do osso temporal, com secreção mucopurulenta intermitente e crônica, próximo ao pavilhão auricular direito. O diagnóstico foi estabelecido com exame clínico, radiográfico, ultrassonográfico e confirmado pelo exame histopatológico das estruturas retiradas. A cápsula cística foi removida cirurgicamente medindo aproximadamente 3,0 x 2,3 cm de diâmetro, preenchida com exsudato mucopurulento e contendo em seu interior duas estruturas dentárias medindo cerca de 0,5 cm de diâmetro e 0,2 cm de diâmetro. O exame microscópico revelou área cística revestida por epitélio escamoso estratificado com infiltrado linfo-histo-plasmocitário na derme, compatível com poliodontia heterotópica. No pós-operatório não houve sequelas neuromotoras e a cicatrização da ferida evoluiu positivamente.(AU)

La poliodontia heterotópica ha sido descrita en la mayoría de las especies domésticas. Conocido como quiste dentígero, pero apropiadamente llamado poliodontia heterotópica, raramente ocurre en equinos, sin embargo se reconoce fácilmente como un defecto congénito. Los quistes generalmente asociados a esa condición contienen parte o la totalidad de las estructuras dentales. El diente heterotópico o estructura dental se encuentra comúnmente adherido al hueso temporal y rodeado por una membrana secretora, con acumulación de exudado y vía de drenaje a lo largo del pabellón auricular proximal o directamente sobre el quiste. En este informe se describe el caso de una hembra, cuarto de milla, de 2,5 años de edad, con 430 kg de peso, presentando poliodontia heterotópica que contenía dos estructuras dentales fácilmente identificables, con un orificio en la región subauricular derecha en el proceso mastoides del hueso temporal, secreción mucopurulenta intermitente y crónica próximo al oído derecho. El diagnóstico se estableció con examen clínico, radiográfico, ecográfico y se confirmó con el examen histopatológico de las estructuras extirpadas. La cápsula quística se extrajo quirúrgicamente midiendo aproximadamente 3,0 x 2,3 cm de diámetro, rellena con exudado mucopurulento y conteniendo en su interior dos estructuras dentales que medían aproximadamente 0,5 cm de diámetro y 0,2 cm de diámetro. El examen microscópico reveló una zona quística cubierta por un epitelio escamoso estratificado con infiltrado linfo-histo-plasmocítico en la dermis, compatible con poliodontia heterotópica. En el postoperatorio no se produjeron secuelas neuromotoras y la cicatrización de la herida evolucionó positivamente.(AU)

Equine heterotopic polyodontia: a case report / Poliodontia heterotópica equina: relato de caso / Poliodontia heterotópica equina: relato de caso

Heterotopic polyodontia have been described in most domestic species. Known as a dentigerous cyst but appropriately called heterotopic polyiodontics, it rarely occurs in horses, however it is easily recognized as a congenital defect. The cysts usually associated with this condition contain part or all of dental structures. The heterotopic tooth or dental structure is usually adhered to the temporal bone and surrounded by a secretory membrane, with a accumulation of exudate and draining tract along the proximal pinna or directly over the cyst. This case report describes in a 2.5-year-old female quarter horse, weighing 430 kg, with a heterotopic polyodontia that contained two easily small's identifiable dental structures, presented for evaluation of a chronic intermittent mucopurulent exudate discharge from the right sub-auricular region in the mastoid process of the temporal bone and a drainage tract near the right pinna. The diagnosis is established with clinical, radiographic, ultrasound and confirmed by histopathological examination of the structures removed. The cystic capsule was surgically removed, measuring approximately 3.0 x 2.3 cm in diameter, filled with mucopurulent exudate and containing two dental structures within 0.5 cm in diameter and 0.2 cm in diameter. Microscopic examination revealed a cystic area covered by stratified squamous epithelium with a lympho-histio-plasmatic cell infiltrate in the dermis, which was compatible with heterotopic polyodontia. Postoperatively, there were no neuromotor sequelae and wound healing evolved positively.(AU)

A poliodontia heterotópica tem sido descrita na maioria das espécies domésticas. Conhecido como cisto dentígero, mas apropriadamente denominado poliodontia heterotópica, raramente ocorre em equinos, porém é facilmente reconhecido como defeito congênito. Os cistos geralmente associados a essa condição contêm parte ou toda as estruturas dentarias. O dente heterotópico ou estrutura dentaria é comumente encontrado aderido ao osso temporal e envolvido por uma membrana secretora, com acúmulo de exsudato e trajeto de drenagem ao longo do pavilhão auricular proximal ou diretamente sobre o cisto. Este relato descreve um caso de em um equino,fêmea, quarto de milha, com 2,5 anos de idade, pesando 430 kg, com poliodontia heterotópica que continha duas estruturas dentarias facilmente indentificadas, apresentando um orifício na região sub-auricular direita no processo mastóideo do osso temporal, com secreção mucopurulenta intermitente e crônica, próximo ao pavilhão auricular direito. O diagnóstico foi estabelecido com exame clínico, radiográfico, ultrassonográfico e confirmado pelo exame histopatológico das estruturas retiradas. A cápsula cística foi removida cirurgicamente medindo aproximadamente 3,0 x 2,3 cm de diâmetro, preenchida com exsudato mucopurulento e contendo em seu interior duas estruturas dentárias medindo cerca de 0,5 cm de diâmetro e 0,2 cm de diâmetro. O exame microscópico revelou área cística revestida por epitélio escamoso estratificado com infiltrado linfo-histo-plasmocitário na derme, compatível com poliodontia heterotópica. No pós-operatório não houve sequelas neuromotoras e a cicatrização da ferida evoluiu positivamente.(AU)

La poliodontia heterotópica ha sido descrita en la mayoría de las especies domésticas. Conocido como quiste dentígero, pero apropiadamente llamado poliodontia heterotópica, raramente ocurre en equinos, sin embargo se reconoce fácilmente como un defecto congénito. Los quistes generalmente asociados a esa condición contienen parte o la totalidad de las estructuras dentales. El diente heterotópico o estructura dental se encuentra comúnmente adherido al hueso temporal y rodeado por una membrana secretora, con acumulación de exudado y vía de drenaje a lo largo del pabellón auricular proximal o directamente sobre el quiste. En este informe se describe el caso de una hembra, cuarto de milla, de 2,5 años de edad, con 430 kg de peso, presentando poliodontia heterotópica que contenía dos estructuras dentales fácilmente identificables, con un orificio en la región subauricular derecha en el proceso mastoides del hueso temporal, secreción mucopurulenta intermitente y crónica próximo al oído derecho. El diagnóstico se estableció con examen clínico, radiográfico, ecográfico y se confirmó con el examen histopatológico de las estructuras extirpadas. La cápsula quística se extrajo quirúrgicamente midiendo aproximadamente 3,0 x 2,3 cm de diámetro, rellena con exudado mucopurulento y conteniendo en su interior dos estructuras dentales que medían aproximadamente 0,5 cm de diámetro y 0,2 cm de diámetro. El examen microscópico reveló una zona quística cubierta por un epitelio escamoso estratificado con infiltrado linfo-histo-plasmocítico en la dermis, compatible con poliodontia heterotópica. En el postoperatorio no se produjeron secuelas neuromotoras y la cicatrización de la herida evolucionó positivamente.(AU)

Mammary gland malignant myoepithelioma in a domestic rabbit (Oryctolagus cuniculus)

Background: Malignant myoepithelioma is a rare neoplasm in humans and rats, poorly reported in dogs and not previously described in rabbits. This study aimed to report a case of malignant mammary myoepithelioma in a domestic rabbit(Oryctolagus cuniculus).Case: A domestic, hybrid, female, entire, nulliparous, 7-year-old rabbit was attended in the Veterinary Hospital Prof. Ricardo Alexandre Hippler at Universidade Vila Velha (UVV) with a history of apathy, lethargy and anorexia. In the clinicalexamination a 5 cm tumour was observed in the right abdominal mammary gland (M2), along with floating smaller lesionsin M1 and M3. There were no palpable abnormalities in the axillary and inguinal lymph nodes. Complete blood count andserum biochemistry were within the normal range. Fine needle aspiration was performed for cytopathological evaluationof the tumour in M2 and it was suggestive of a malignant glandular neoplasm, with probable epithelial origin. Completestaging included chest and abdominal radiographs, but they were unremarkable. The patient was submitted to a rightunilateral mastectomy, involving resection of the inguinal lymph node. The sample was sent to the Laboratory of AnimalPathology of UVV for routine histological evaluation. Histopathological evaluation in M2 was compatible with malignantmyoepithelioma based on the literature, while nodules in M1 and M3 were classified as mammary cysts. The inguinal lymphnode showed no significant abnormalities. An immunohistochemical panel was performed in the Comparative PathologyLaboratory of the Institute of Biological Sciences of the Universidade Federal de Minas Gerais (UFMG), using immunomarkers (pan-cytokeratin, p63 and vimentin) to characterize the tumour and confirm its diagnosis. Immunohistochemistryrevealed expression of p63, and was negative for pan-cytokeratin and vimentin, which confirmed the myoepithelial origin,without involvement of the epithelial compartment...(AU)

Solitary osseous plasmacytoma of a lumbar vertebrae with systemic involvement in a dog

Background: Myeloma-related disorders are characterized by proliferation of neoplastic plasma cell or immature immunoglobulin secreting B-lymphocytes, and include multiple myeloma, M-macroglobulinemia and extra-medullary plasmacytoma(cutaneous or extra-cutaneous). Solitary osseous plasmacytoma (SOP) is considered an unique entity among extra-medullaryextra-cutaneous plasmacytoma. It is an unusual neoplasia in dogs, predominantly found in middle-aged to older animals,with a higher incidence in bones of axial skeleton. Dogs with vertebral SOP present neurological signs related to spinalcord compression, but progression to multiple myeloma is related to a poor outcome. As in humans, progression to multiple myeloma occurs in most cases, although it may take months or years from its initial presentation. SOP’s biologicalbehaviour, incidence and prognostic are rarely documented. Chemotherapy with melphalan and prednisolone representthe most used protocol for multiple myeloma. However, in SOP, the combination of chemotherapy with local approachesis controversial before the evidence of systemic disease. This paper aims at reporting a case of SOP in a lumbar vertebraeof a dog, with systemic involvement.Case: A 11-year old male mixed breed dog was attended presenting muscle weakness, lethargy, anorexia, adipsia and intense pain manifestation. The dog also presented multiple skin nodules, previously diagnosed as a plasmacytoma, throughcytology. The dog’s poor clinical condition and aggressive temper, associated with suspicious of an advanced myelomarelated disorder, resulted in the decision for humanized euthanasia. At necropsy, a pale, friable and hemorrhagic masswas identified on the L3 lumbar vertebrae, associated with an osteolytic bone lesion and spinal cord compression. Histopathological analyses revealed proliferation of plasma cells, with pale perinuclear halo, moderate cellular pleomorphism,10 binucleated cells and 10 mitotic figures per 10 high...

Mammary gland malignant myoepithelioma in a domestic rabbit (Oryctolagus cuniculus)

Background: Malignant myoepithelioma is a rare neoplasm in humans and rats, poorly reported in dogs and not previously described in rabbits. This study aimed to report a case of malignant mammary myoepithelioma in a domestic rabbit(Oryctolagus cuniculus).Case: A domestic, hybrid, female, entire, nulliparous, 7-year-old rabbit was attended in the Veterinary Hospital Prof. Ricardo Alexandre Hippler at Universidade Vila Velha (UVV) with a history of apathy, lethargy and anorexia. In the clinicalexamination a 5 cm tumour was observed in the right abdominal mammary gland (M2), along with floating smaller lesionsin M1 and M3. There were no palpable abnormalities in the axillary and inguinal lymph nodes. Complete blood count andserum biochemistry were within the normal range. Fine needle aspiration was performed for cytopathological evaluationof the tumour in M2 and it was suggestive of a malignant glandular neoplasm, with probable epithelial origin. Completestaging included chest and abdominal radiographs, but they were unremarkable. The patient was submitted to a rightunilateral mastectomy, involving resection of the inguinal lymph node. The sample was sent to the Laboratory of AnimalPathology of UVV for routine histological evaluation. Histopathological evaluation in M2 was compatible with malignantmyoepithelioma based on the literature, while nodules in M1 and M3 were classified as mammary cysts. The inguinal lymphnode showed no significant abnormalities. An immunohistochemical panel was performed in the Comparative PathologyLaboratory of the Institute of Biological Sciences of the Universidade Federal de Minas Gerais (UFMG), using immunomarkers (pan-cytokeratin, p63 and vimentin) to characterize the tumour and confirm its diagnosis. Immunohistochemistryrevealed expression of p63, and was negative for pan-cytokeratin and vimentin, which confirmed the myoepithelial origin,without involvement of the epithelial compartment...

Solitary osseous plasmacytoma of a lumbar vertebrae with systemic involvement in a dog

Background: Myeloma-related disorders are characterized by proliferation of neoplastic plasma cell or immature immunoglobulin secreting B-lymphocytes, and include multiple myeloma, M-macroglobulinemia and extra-medullary plasmacytoma(cutaneous or extra-cutaneous). Solitary osseous plasmacytoma (SOP) is considered an unique entity among extra-medullaryextra-cutaneous plasmacytoma. It is an unusual neoplasia in dogs, predominantly found in middle-aged to older animals,with a higher incidence in bones of axial skeleton. Dogs with vertebral SOP present neurological signs related to spinalcord compression, but progression to multiple myeloma is related to a poor outcome. As in humans, progression to multiple myeloma occurs in most cases, although it may take months or years from its initial presentation. SOPs biologicalbehaviour, incidence and prognostic are rarely documented. Chemotherapy with melphalan and prednisolone representthe most used protocol for multiple myeloma. However, in SOP, the combination of chemotherapy with local approachesis controversial before the evidence of systemic disease. This paper aims at reporting a case of SOP in a lumbar vertebraeof a dog, with systemic involvement.Case: A 11-year old male mixed breed dog was attended presenting muscle weakness, lethargy, anorexia, adipsia and intense pain manifestation. The dog also presented multiple skin nodules, previously diagnosed as a plasmacytoma, throughcytology. The dogs poor clinical condition and aggressive temper, associated with suspicious of an advanced myelomarelated disorder, resulted in the decision for humanized euthanasia. At necropsy, a pale, friable and hemorrhagic masswas identified on the L3 lumbar vertebrae, associated with an osteolytic bone lesion and spinal cord compression. Histopathological analyses revealed proliferation of plasma cells, with pale perinuclear halo, moderate cellular pleomorphism,10 binucleated cells and 10 mitotic figures per 10 high...(AU)

Epidemiology of canine mammary gland tumours in Espírito Santo, Brazil

Background: Mammary tumours represent about 50 to 70% of all neoplasms in female dogs and their occurrence is directlyrelated to the reproductive status and patient´s age. The purpose of this research was to apply the Brazilian consensus ondiagnosis, prognosis and treatment of canine mammary tumours and to define the regional epidemiological aspects ofcanine mammary gland tumours in Vitoria metropolitan region (ES, Brazil) between 2012 and 2016 and to correlate themacroscopic characteristics such as lesion size and location of the neoplasm with histopathological diagnosis, tumoursgrade and lymph node metastasis.Materials, Methods & Results: Data were collected from the archives of the Laboratory of Animal Pathology of UVV andmedical records of patients attended at the Veterinary Hospital Prof. Ricardo Alexandre Hippler in 5 years (2012 to 2016). Theanimals were separated into groups by age to facilitate classification in the group with the highest occurrence of neoplasms. Theevaluation of the macroscopic characteristics was performed through the histopathological record described in the pathologylaboratory, for each patient, at the time of the initial evaluation. After descriptive analysis, data was correlated using Spearmanntest, and frequency dispersion was evaluated using chi-square test, both in the software Graph Pad Prism v. 6.01. This studyincluded 255 bitches and diagnosis of 486 lesions, once 48.6% of the dogs had more than one lesion, classified according tothe Brazilian Consensus for Canine Mammary Tumours and graded according to Elston and Ellis system. 86.8% of lesionswere consistent with actual mammary neoplasms, of which 67% were malignant and 20% were benign. Non-neoplastic lesionscorresponded to 7.2% of cases and 5.8% were extra-mammary neoplasms, with an increased incidence of lipomas (39.3%) andmast cell tumours (32.1%). Cross-breed dogs represented 26.7% of cases. Poodles (25.5%), Pinschers (9.8%) and Dachshund(4.7%)...(AU)

Epidemiology of canine mammary gland tumours in Espírito Santo, Brazil

Background: Mammary tumours represent about 50 to 70% of all neoplasms in female dogs and their occurrence is directlyrelated to the reproductive status and patient´s age. The purpose of this research was to apply the Brazilian consensus ondiagnosis, prognosis and treatment of canine mammary tumours and to define the regional epidemiological aspects ofcanine mammary gland tumours in Vitoria metropolitan region (ES, Brazil) between 2012 and 2016 and to correlate themacroscopic characteristics such as lesion size and location of the neoplasm with histopathological diagnosis, tumoursgrade and lymph node metastasis.Materials, Methods & Results: Data were collected from the archives of the Laboratory of Animal Pathology of UVV andmedical records of patients attended at the Veterinary Hospital Prof. Ricardo Alexandre Hippler in 5 years (2012 to 2016). Theanimals were separated into groups by age to facilitate classification in the group with the highest occurrence of neoplasms. Theevaluation of the macroscopic characteristics was performed through the histopathological record described in the pathologylaboratory, for each patient, at the time of the initial evaluation. After descriptive analysis, data was correlated using Spearmanntest, and frequency dispersion was evaluated using chi-square test, both in the software Graph Pad Prism v. 6.01. This studyincluded 255 bitches and diagnosis of 486 lesions, once 48.6% of the dogs had more than one lesion, classified according tothe Brazilian Consensus for Canine Mammary Tumours and graded according to Elston and Ellis system. 86.8% of lesionswere consistent with actual mammary neoplasms, of which 67% were malignant and 20% were benign. Non-neoplastic lesionscorresponded to 7.2% of cases and 5.8% were extra-mammary neoplasms, with an increased incidence of lipomas (39.3%) andmast cell tumours (32.1%). Cross-breed dogs represented 26.7% of cases. Poodles (25.5%), Pinschers (9.8%) and Dachshund(4.7%)...

Effects of topical application of pure and ozonized andiroba oil on experimentally induced wounds in horses / Efeitos do uso tópico do óleo de andiroba puro e ozonizado em feridas induzidas em cavalos

The aim of this study was to evaluate clinical and histopathological aspects of topical application of pure and ozonized andiroba oil (Carapa guianensis Aublet.) on the healing process of wounds in healthy horses. Eight 6.25 cm2 wounds were surgically produced on each horse, from the cranial region to the sacrum, being four wounds on each side of the lumbar region. In three animals, left side was used for macroscopic observations and area measurement and right side was used for histopathological analysis. For the other two animals, evaluations were inverted. The beginning of the topical treatment occurred 12 hours after surgical induction of the injuries and was maintained daily until complete healing of the wounds, using saline solution (GC), ozonized saline solution (GO) sequentially and bilaterally in the craniocaudal direction, pure andiroba oil (GAP) and ozonized andiroba oil (GAO). Randomly, the sequence of the treatments was modified. Macroscopic and histopathological analyses were performed at 3, 7, 14, and 21 days after surgery. The time for complete healing of all wounds was recorded. A wound contraction of 67.75% for GC, 65.26% for GO, 67.91% for GAP, and 69.84% for GAO were recorded. Histopathologic evaluation revealed that wounds from the GAO and GAP had an advanced epithelialization, fibroblast proliferation and collagen deposition, moderate vascular proliferation, and presence of PMN infiltrate and discrete viewing of MN. It was possible to conclude that all treatments had benefits when comparing to control group, concluding that both pure and ozonized andiroba oil may be good options for treating wounds in horses.(AU)

Este trabalho realizou uma avaliação clínica e histopatológica da aplicação tópica do óleo de andiroba (Carapa guianensis Aublet), puro e ozonizado, no processo de cicatrização de feridas em cinco equinos saudáveis. Oito feridas de 6,25 cm2 foram induzidas cirurgicamente, quatro de cada lado da região lombar, craniais em relação à região sacral. Em três animais, o lado esquerdo foi destinado à avaliação macroscópica e mensuração de área, enquanto o lado direito foi destinado à análise histopatológica. Nos outros dois animais, as avaliações foram invertidas. O tratamento tópico foi iniciado 12 horas após a indução cirúrgica e foi mantido diariamente até a completa cicatrização das feridas. Foram usados, sequencialmente e bilateralmente, no sentido craniocaudal: solução salina (GC), solução salina ozonizada (GO), óleo de andiroba puro (GAP) e óleo de andiroba ozonizado (GAO). Aleatoriamente, a sequência de tratamentos foi modificada. As análises macroscópicas e microscópicas foram realizadas 3, 7, 14 e 21 dias após a cirurgia, e o tempo total para cicatrização registrado. A contração da ferida foi de 67,75% para GC, 65,26% para GO, 67,91% para GAP, e 69,84% para GAO. A avaliação histopatológica demonstrou que as feridas tratadas com GAO e GAP apresentaram uma avançada epitelização, proliferação fibroblástica e deposição de colágeno, moderada proliferação vascular e presença de infiltrados de células polimorfonucleares (PMN) e discreta proliferação de células mononucleares (MN). Foi possível concluir que todos os tratamentos usados foram benéficos perante o grupo de controle, mostrando que as versões pura e ozonizada do óleo de andiroba representam alternativas terapêuticas ao tratamento de feridas em equinos.(AU)

Effects of topical application of pure and ozonized andiroba oil on experimentally induced wounds in horses / Efeitos do uso tópico do óleo de andiroba puro e ozonizado em feridas induzidas em cavalos

The aim of this study was to evaluate clinical and histopathological aspects of topical application of pure and ozonized andiroba oil (Carapa guianensis Aublet.) on the healing process of wounds in healthy horses. Eight 6.25 cm2 wounds were surgically produced on each horse, from the cranial region to the sacrum, being four wounds on each side of the lumbar region. In three animals, left side was used for macroscopic observations and area measurement and right side was used for histopathological analysis. For the other two animals, evaluations were inverted. The beginning of the topical treatment occurred 12 hours after surgical induction of the injuries and was maintained daily until complete healing of the wounds, using saline solution (GC), ozonized saline solution (GO) sequentially and bilaterally in the craniocaudal direction, pure andiroba oil (GAP) and ozonized andiroba oil (GAO). Randomly, the sequence of the treatments was modified. Macroscopic and histopathological analyses were performed at 3, 7, 14, and 21 days after surgery. The time for complete healing of all wounds was recorded. A wound contraction of 67.75% for GC, 65.26% for GO, 67.91% for GAP, and 69.84% for GAO were recorded. Histopathologic evaluation revealed that wounds from the GAO and GAP had an advanced epithelialization, fibroblast proliferation and collagen deposition, moderate vascular proliferation, and presence of PMN infiltrate and discrete viewing of MN. It was possible to conclude that all treatments had benefits when comparing to control group, concluding that both pure and ozonized andiroba oil may be good options for treating wounds in horses.(AU)

Este trabalho realizou uma avaliação clínica e histopatológica da aplicação tópica do óleo de andiroba (Carapa guianensis Aublet), puro e ozonizado, no processo de cicatrização de feridas em cinco equinos saudáveis. Oito feridas de 6,25 cm2 foram induzidas cirurgicamente, quatro de cada lado da região lombar, craniais em relação à região sacral. Em três animais, o lado esquerdo foi destinado à avaliação macroscópica e mensuração de área, enquanto o lado direito foi destinado à análise histopatológica. Nos outros dois animais, as avaliações foram invertidas. O tratamento tópico foi iniciado 12 horas após a indução cirúrgica e foi mantido diariamente até a completa cicatrização das feridas. Foram usados, sequencialmente e bilateralmente, no sentido craniocaudal: solução salina (GC), solução salina ozonizada (GO), óleo de andiroba puro (GAP) e óleo de andiroba ozonizado (GAO). Aleatoriamente, a sequência de tratamentos foi modificada. As análises macroscópicas e microscópicas foram realizadas 3, 7, 14 e 21 dias após a cirurgia, e o tempo total para cicatrização registrado. A contração da ferida foi de 67,75% para GC, 65,26% para GO, 67,91% para GAP, e 69,84% para GAO. A avaliação histopatológica demonstrou que as feridas tratadas com GAO e GAP apresentaram uma avançada epitelização, proliferação fibroblástica e deposição de colágeno, moderada proliferação vascular e presença de infiltrados de células polimorfonucleares (PMN) e discreta proliferação de células mononucleares (MN). Foi possível concluir que todos os tratamentos usados foram benéficos perante o grupo de controle, mostrando que as versões pura e ozonizada do óleo de andiroba representam alternativas terapêuticas ao tratamento de feridas em equinos.(AU)