Comparative study of direct and indirect immunofluorescence for diagnosis of canine pemphigus foliaceus / Estudo comparativo da imunofluorescência direta e indireta para o diagnóstico do pênfigo foliáceo canino

Pemphigus foliaceus (PF) is the most common autoimmune skin disease in dogs. It is characterized by pustules, erosions, and crusts which occur due to the presence of autoantibodies that target intercellular adhesion. Histopathological examination is considered the gold standard pattern in the diagnosis, but may sometimes be inconclusive, especially when the characteristic findings are not identified. New diagnostic tests are continuously being developed and immunofluorescence assays, could be a valuable alternative diagnostic tool. This study aimed to evaluate the applicability of direct and indirect immunofluorescence (DIF and IIF) tests for the diagnosis of canine PF. Twenty eight dogs were divided into two groups: Group I with 14 dogs with PF and Group II (control) with 14 dogs with Superficial pyoderma (differential diagnoses of PF). All animals were submitted to skin biopsy to histopathological and DIF. Blood samples were collected to assess IIF. Comparing the DIF results against the histopathology test, there was an agreement of 75% (9/12) with a Kappa index of 0.77 (P<0.001). Considering IIF, the agreement was 100% (14/14), with a Kappa index of 1.0 (P<0.001). We conclude that DIF and IIF are highly effective and were useful and effective complementary examination tests for an improvement in the diagnosis of canine PF.(AU)

O pênfigo foliáceo (PF) é considerado uma das doenças tegumentares autoimunes mais frequentes em cães. Clinicamente, caracteriza-se pela presença de pústulas, erosões e crostas. O exame histopatológico é considerado o teste diagnóstico de eleição, porém pode se mostrar inconclusivo, sobretudo quando os achados característicos da doença não são observados. Novas ferramentas diagnósticas têm sido desenvolvidas e os testes de imunofluorecência são uma valiosa alternativa. Este estudo teve como objetivo avaliar a aplicabilidade das reações de imunofluorescência direta (IFD) e indireta (IFI) para o diagnóstico do PF canino. Vinte e oito cães foram divididos em dois grupos: grupo I com 14 cães com PF e grupo II (controle) com 14 cães com piodermite superficial (um dos principais diagnósticos diferenciais do PF). Todos os animais foram submetidos à biópsia cutânea, seguida de exame histopatológico e IFD. Amostras de sangue foram coletadas para realização da IFI. Comparando-se os valores de IFD com o histopatológico, obtiveram-se valores de concordância de 75% (9/12), com índice Kappa de 0,77 (P<0,001). Já na IFI, a concordância foi de 100% (14/14), com índice Kappa de 1,0 (P<0,001). Concluiu-se, então, que a IFD e a IFI apresentaram excelentes resultados e podem ser consideradas novas alternativas diagnósticas do PF canino.(AU)

Dermatite micobacteriana atípica em gato: relato de caso / Atypical mycobacterial dermatitis in cat: a case report

Relata-se, pela primeira vez no Brasil, um caso de dermatite decorrente de infecção por micobactéria atípica do complexo Mycobacterium fortuitum-peregrinum, em espécie felina, sem raça definida, fêmea, com cinco anos de idade. Há oito meses, evoluía com lesões maculares equimóticas, nodulares, erosadas, ulceradas, acompanhadas de fístulas exsudativas, com intenso prurido e algia. Evidenciou-se a presença de micobactéria do complexo Mycobacterium fortuitum-peregrinum (grupo IV de Runyon ) identificada após evidenciação histopatológica, cultivo bacteriano e por testes bioquímicos. Após dois meses de terapia sistêmica com enrofloxacina (5mg/kg/Bid/VO) e tópica (triclosan e rifamicina) houve involução das lesões, com efeitos colaterais discretos.

A case of dermatitis caused by atypical mycobateria of Mycobacterium fortuitum peregrinum complex was observed for the first time in Brazil. A five-year-old female mixed breed cat had a dermatitis process which had started eight months before. Lesions were characterized by macules, nodules, erosions, ulcers and exsudative fistulas, with intensive pruritus and pain. It had failed to respond to clinical treatment and surgical excision. The diagnosis was based on history, physical and dermatologic examination and complementary tests (cytologic, bacterioscopic, bacterial culture, histopathological, hemathological, ultrasonographic, radiographic and electrocardiographic). The presence of mycobacteria of Mycobacterium fortuitum-peregrinum complex (group IV of Runyon) was observed and identified after histopathological evidence, bacterial culture and biochemical tests. After two months of systemic therapy with enrofloxacin (5mg/kg, orally/twice a day) and topic treatment with triclosan and rifamicin, rapid improvement of the clinical appearance of the lesions were observed with low incidence of side-effects.

Cutaneous T-cell lymphoma with HTLV-I infection: clinical overlap with adult T-cell leukemia/lymphoma.

Adult T-cell leukemia/lymphoma (ATLL) is a malignant proliferation of mature helper T lymphocytes,(1) and is caused by human T-lymphotropic virus type I (HTLV-I);(2) an HTLV-I infection endemic in the Caribbean, south-western Japan, South America and Africa.(3,4) Seroepidemiological studies suggest that it is also endemic in Brazil.(5) Although carriers of HTLV-I show polyclonal integration of virus in T lymphocytes, only patients with ATLL of various subtypes show monoclonal integration of HTLV-I in tumor cells.(6,7) Cutaneous T-cell lymphomas (CTCL) are a group of primary cutaneous lymphoproliferative diseases(8) with unknown etiology.(9) The two most common presentations of CTCL are mycosis fungoides (MF) and Sézary syndrome (SS).(10-13) However, both CTCL categories can easily resemble ATLL. Therefore, in HTLV-I endemic areas, differentiation between ATLL and CTCL must be performed, as they have different prognoses and treatment approaches.(14).

Dermoscopic examination of the nail bed and matrix.

Abstract Background Dermoscopy has furthered advances in the differential diagnosis of longitudinal melanonychia; however, fewer details observed in the nail, as compared to skin lesions, make interpretation difficult. Methods Ten cases of longitudinal melancholia, from several etiologies, were submitted to direct dermoscopic examination of the nail bed and matrix. Results We observed the presence of globules, streaks, and pigment network in the nail bed and matrix, which are dermoscopic features not seen in the nail plate. Conclusions This procedure enables visualization of dermascopic features not seen in the nail plate, making the diagnosis of melanocytic lesions easier.

Photoprotective effect of Pothomorphe umbellata root extract against ultraviolet radiation induced chronic skin damage in the hairless mouse.

In this study we evaluated the activity of Pothomorphe umbellata root extract on hairless mice chronically exposed to UVB radiation (76.5 mJ/cm(2), 4 days per week for 22 weeks). Mouse dorsal surfaces were treated topically with 20 mg/cm(2) of a carbomer 940 gel (vehicle) with or without P. umbellata root extract to a final concentration of 0.1%, for 2 h before irradiation. Another irradiated group received no topical treatment. A fourth group received no treatment and was not irradiated. Visible skin wrinkling was evaluated using a scale ranging from 0 to 4, where 0 corresponds to no skin modification, and 4 to the maximum visual skin alteration observed in our experiments. Histological measurements were carried out on standard haematoxylin & eosin stained sections. The mean distances between the outermost surface of the epidermis (excluding the stratum corneum) and the dermal-epidermal junction were determined by morphometric analysis. These distances were statistically increased in the irradiated control groups when compared to the nonirradiated control group and to the irradiated group using P. umbellata root extract. These data demonstrate that P. umbellata may be successfully used as a topical skin-protecting agent against the deleterious effects of UV radiation.

Criptococose canina: relato de caso / Canine ocular cryptococcosis: a case report

Descreve-se, pela primeira vez no Brasil, um caso de criptococose canina com acometimento oftalmo e dermatopático, com diagnóstico intra-vitam, em animal da raça Pastor Alemão, fêmea, com 24 meses de vida, criado em São Paulo, em contacto com outros cinco cães assintomáticos, que havia se infectado pelo contato com dejetos de pombos (Columba livia). Evoluia há 90 dias, com quadro tegumentar e ósseo, sintomas e lesões características, sendo, ainda, detectada forma assintomática de coriorretinite, de início unilateral. O diagnóstico foi estabelecido pelos dados da anamnese, dos exames físico, dermatológico e complementares (radiográfico, cultivo micológico, histopatologia de pele) tendo-se evidenciado e isolado cepa de Criptococcus neoformans var. neoformans. Após nove meses de terapia com itraconazol (9mg/kg/SID/VO) houve involução total do quadro, sem qualquer efeito adverso à droga.

Lymphangitic sporotrichosis: an uncommon bilateral localization.

Sporotrichosis is a mycotic disease caused by cutaneous inoculation of the dimorphic fungus Sporothrix schenckii. The primary lesion can spread and often develop a unilateral lymphocutaneous lesions or, rarely, disseminated disease. We report a lymphangitic sporotrichosis case with ulcerated erythematous nodules distributed bilaterally on the posterior and medical aspect of the both legs, probably due to multiple inoculations. The treatment with oral potassium iodide was satisfactory.

Paracoccidioidomycosis: an uncommon localization in the scrotum.

Paracoccidioidomycosis is a systemic fungal infection caused by the thermally dimorphic fungus Paracoccidioides brasiliensis. The authors present a case of a 49-year-old man who developed verrucous lesions on nasal mucosa and on genital localization (inguinal and scrotal), without signs of systemic disease. Direct mycological examination, culture on Sabouraud glucose medium, and biopsy were positive for P. brasiliensis. The interest of this case is the genital localization which is uncommon in this infection. Moreover, there are few cases described in the literature.

Cutaneous immediate and late phase reactions to schistosomin in schistosomiasis patients.

Cutaneous immediate and late phase reactions (LPR) to schistosomin were studied in 29 patients with schistosomiasis mansoni. In 12 of these patients, the determination of total and specific serum IgE by immunoenzymatic method against schistosome antigen was carried out using serum samples obtained on the same day as the cutaneous tests. Skin biopsies were taken from 4 typical LPRs. Immediate reactions occurred in all except one and LPRs in 12 (41.3%). Patients with positive cutaneous reactions had highe levels of specific serum IgE against schistosome antigen. Histopathological studies showed a moderate exudate consisting mainly of neutrophils (60%) and eosinophils (40%). LPRs in schistosomiasis have the same characteristics reported in the medical literature in relation to time of appearance, morphology and histopathology. The immunopathogenic role played by LPRs in the patients remains to be clarified.

[Importance of Perls stain in histologic diagnosis of Kaposi sarcoma]. / Intérêt de la coloration de Perls dans le diagnostic histologique du sarcome de Kaposi.

The authors studied 27 cases of Kaposi's sarcoma, 23 cases of pyogenic granuloma, 18 cases of hemangioma, 17 cases of stasis dermatitis and 9 cases of dermatofibroma. In all these cases, they used the hematoxylin-eosin stain and Perls' stain', and they showed the presence of hemosiderin in all the cases of Kaposi's sarcoma and stasis dermatitis. The hemangioma and the dermatofibroma presented 50% of positivity, and the pyogenic granuloma, only 26.1%.

Mycobacteriosis in domestic dogs. Report of two cases in Sao Paulo, Brazil

Na clínica dermatológica veterinária por vezes atendem-se carnívoros domésticos com lesöes ulceradas de evoluçäo prolongada e, geralmente, rebeldes à terapia usual, que podem ser originárias de infecçöes por micobactérias do gênero Mycobacterium. Pela escassez de descriçöes na bibliografia brasileira, pelo inusitado das lesöes e pela resposta à terapia preconizada, descrevem-se dois casos de micobacteriose em caninos atendidos na FMVZ/USP. As cadelas (Pastor Alemäo, Doberman), adultas, apresentavam lesöes ulceradas graves, nas faces posteriores dos pavilhöes auriculares, de aspecto granulomatoso, exsudativas, recobertas por crostas hemorrágicas. Inexistiam linfoadenomegalia satélite e tampouco sintomas nos demais sistemas orgânicos. Complementaram-se os exames físico, hematológico e radiológico por curetagem das lesöes e biópsias de pele que foram entäo submetidas a exames histopatológico, bacteriológico (direto: técnicas de Holst-Mitchinson e Radhakrishna, Ziehl-Neelsen); cultivo (meios de Lowenstein-Jensen e de Stonebrink & Leslie), em diferentes temperaturas; teste de tuberculina (PPD mamífero e aviário). Demonstrou-se, na bacterioscopia e na histopatologia, a presença de bacilos ácido-álcool resistentes que näo cresceram nos meios de cultivo convencionais, mesmo quando submetidos a várias temperaturas distintas, bem como quadro tecidual piogranulomatoso típico. Após a interposiçäo da terapêutica tópica (soluçäo de Burrow, sal sódico de rifamicina) e parenteral (rifampicina) obteve-se flagrante melhora com remissäo do quadro lesional. Discutem-se a etiopatogenia do quadro e as condutas diagnóstica e terapêutica

[Annular granuloma in HIV-positive patient]. / Granuloma anular en paciente HIV-positivo.

The Authors present a HIV-positive patient with atypical lesions of Granuloma annulare near the joints. Ten HIV-positive patients with Granuloma annulare have been reported until now in the world literature, and these cases are reviewed.

[Idiopathic skin calcinosis with transepithelial elimination]. / Calcinose cutánea idiopática com eliminação transepitelial.

A case of universal cutaneous calcinosis developed without apparent cause is reported. It had an evolution towards epidermic perforation and was treated with aluminium hydroxide. A discussion was made on the rarity of the idiopathic calcinosis as well as on the interesting phenomenon of transepidermal elimination.