Primary Osteoma Cutis in the Interscapular Region of a Dog.

A 9-year-old neutered male Shih Tzu was presented with three contiguous firm nodules in the subcutaneous tissue of the interscapular region. Histopathological examination revealed that the nodules consisted of mature lamellar bone with a Haversian system, with no apparent lesion around the bone. Clinical examination revealed that the dog had no underlying disease and no history of trauma at the lesion site. Based on these findings and on the medical history, a diagnosis of primary osteoma cutis was made. Osteoma cutis is rare in both human and veterinary medicine, and most dogs reported to have secondary osteoma cutis. To our knowledge, this case is only the second report of primary osteoma cutis in a dog.

Rapid on-site evaluation during endoscopic ultrasound-guided fine-needle aspiration of lymph nodes does not increase diagnostic yield: A randomized, multicenter trial.

OBJECTIVES: Studies on the impact of rapid on-site evaluation (ROSE) during endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) of lymph nodes are retrospective and have shown conflicting results. We aimed to compare the diagnostic yield of EUS-FNA of lymph nodes with ROSE (ROSE+) and without ROSE (ROSE-). METHODS: This was a multicenter, randomized controlled trial. Consecutive patients who were scheduled to undergo EUS-FNA of mediastinal or abdominal lymph nodes were randomized to ROSE+ or ROSE-. In the ROSE+ group, the number of passes was dictated by the on-site cytotechnician. In the ROSE- group, five passes were performed without interference from the cytotechnician. All samples were reviewed by a single-expert cytopathologist, blinded to group allocation. Primary endpoint was diagnostic yield with and without ROSE. RESULTS: After inclusion of 90 patients, interim analysis showed futility of study continuation since diagnostic yield of ROSE+ and ROSE- were comparable. A total of 91 patients were randomized to ROSE+ (N = 45) or ROSE- (N = 46). Diagnostic yield of ROSE+ and ROSE- and diagnostic accuracy were comparable: 93.3% vs. 95.7% (P = 0.68) and 97.6% vs. 93.2% (P = 0.62), respectively. Two major complications (one per group) occurred (p = 0.99). ROSE- patients more often reported self-limiting post-procedural pain (p < 0.001). Median procedure time for ROSE+ (20 min) and ROSE- (23 min) was comparable (P = 0.06). Median time to review slides in the ROSE- group (12:47 min) was longer than with ROSE+ (7:52 min) (P < 0.001). Mean costs of ROSE- and ROSE+ were comparable: €938.29 (±172.70) vs. €945.98 (±223.38) (P = 0.91), respectively. CONCLUSIONS: Diagnostic yield and accuracy of EUS-FNA of mediastinal and abdominal lymph nodes with and without ROSE are comparable. Time needed to review slides was shorter and post-procedural pain was less often reported in the ROSE+ group. Based on the primary outcome, the implementation of ROSE during EUS-FNA of mediastinal and abdominal lymph nodes cannot be advised. (Dutch Trial Register: NTR4876).

Intra-oral Sebaceous Gland Tumours in Two Dogs.

A 12-year-old female miniature schnauzer and a 12-year-old neutered female cocker spaniel each had a grey-yellow nodular lesion arising from the gingiva. Microscopical examination showed that both nodules were composed of varied proportions of sebocytes and basal-type reserve cells with few ducts lined by stratified squamous epithelium. Based on the histopathological findings, the cases were diagnosed as sebaceous adenoma and sebaceous epithelioma, respectively. In man, the occurrence of sebaceous neoplasms in the oral cavity has been reported to some extent, but these lesions are very rare in animals. To the best of our knowledge, this is the first report of intra-oral sebaceous neoplasms in dogs. Intra-oral sebaceous epithelioma has never been reported in animals.

Systemic Mycobacterium kansasii Infection in a Domestic Shorthair Cat.

A 1-year-old, female domestic shorthair cat was presented with anorexia, depression and weight loss, accompanied by multifocal nodules affecting the face, pinnae and periarticular tissue. Routine medical treatments were ineffective. The animal's physical condition continued to deteriorate and it finally died. Post-mortem examination revealed multifocal to coalescing firm nodules with occasional ulceration affecting the ears, peri-ocular areas, nasal planum, oral cavity and laryngopharyngeal region. Tan-coloured, firm, nodular lesions were also observed in the periarticular tissue, lungs and tracheobronchial and mediastinal lymph nodes. Impression smears of several of these lesions revealed a myriad of slender rod-shaped organisms, mainly in the cytoplasm of macrophages. Histopathological examination showed severe pyogranulomatous inflammation with or without necrosis in the nodules. Acid-fast staining revealed large numbers of acid-fast bacilli. Mycobacterium kansasii was detected in the tissues using multiplex polymerase chain reaction and DNA sequencing. No protozoal or fungal organisms were detected using special stains. On the basis of these results, the cat was diagnosed with systemic M. kansasii infection. To our knowledge, there have been few reports of M. kansasii infection, especially with systemic spread, in cats.

Long-Term Management with Adipose Tissue-Derived Mesenchymal Stem Cells and Conventional Treatment in a Dog with Hepatocutaneous Syndrome.

Hepatocutaneous syndrome (HS) is an uncommon skin disorder that occurs in conjunction with liver disease and is diagnosed based on decreased plasma concentrations of amino acids and the histopathology of skin lesions. The survival period generally is <6 months. A 10-year-old castrated male Maltese dog was presented for evaluation of lethargy, polyuria, polydipsia, and skin lesions including alopecia, erythema, and crusts. Based on increased liver enzyme activity, low plasma amino acid concentrations, and findings from liver cytology and skin biopsy, the dog was diagnosed with HS. In addition to administration of antioxidants, hepatoprotective agents, and amino acids IV, allogenic adipose tissue-derived mesenchymal stem cells were infused 46 times over a 30-month period: 8 times directly into the liver parenchyma guided by ultrasonography and the remainder of the times into peripheral veins. After commencing stem cell therapy, the dog's hair re-grew and the skin lesions disappeared or became smaller. During ongoing management, the patient suddenly presented with anorexia and uncontrolled vomiting, and severe azotemia was observed. The dog died despite intensive care. On necropsy, severe liver fibrosis and superficial necrolytic dermatitis were observed. The dog survived for 32 months after diagnosis. A combination of amino acid and stem cell therapy may be beneficial for patients with HS.

The value of 3.0Tesla diffusion-weighted MRI for pelvic nodal staging in patients with early stage cervical cancer.

OBJECTIVE: The purpose of this study is to investigate the diagnostic accuracy of 3.0Tesla (3T) diffusion-weighted magnetic resonance imaging (MRI) in addition to conventional MRI for the detection of lymphadenopathy in patients with early stage cervical cancer compared to histopathological evaluation of the systematically removed pelvic lymph nodes as reference standard. METHODS: 68 fédération internationale de gynécologie obstétrique (FIGO) stage Ia2 to IIb cervical cancer patients were included. Sensitivity and specificity rates for two experienced observers were computed for the detection of lymphatic metastasis. Reproducibility of conventional MRI was tested by kappa statistics. The variables included in the analysis were: size of the long axis, short axis, ratio short to long axis and apparent diffusion coefficient (ADC). RESULTS: Nine patients had 15 positive pelvic nodes at histopathological examination. The sensitivity and specificity of lymphatic metastasis detection by predefined conventional MRI characteristics was 33% (95% Confidence Interval (CI) 3-64) and 83% (95% CI 74-93) on patient level, and 33% (95% CI 7-60) and 97% (95% CI 95-99) on regional level respectively for observer 1. For observer 2 the sensitivity was 33% (95% CI 3-64) and the specificity 93% (95% CI 87-100) on patient level, and 25% (95% CI 1-50) and 98% (95% CI 97-100) on regional level, respectively. The kappa-value for reproducibility of metastasis detection on regional level was 0.50. The short axis diameter showed the highest diagnostic accuracy (area under the curve (AUC)=0.81 95% CI 0.70-0.91); ADC did not improve diagnostic accuracy (AUC=0.83 95% CI 0.73-0.93). CONCLUSIONS: Diffusion-weighted MRI did not result in additional diagnostic value compared to conventional MRI.

The reliability of the histological diagnosis of endometritis in asymptomatic IVF cases: a multicenter observer study.

BACKGROUND: Chronic endometritis is associated with abnormal uterine bleeding, recurrent abortion and infertility. It is a subtle condition, and therefore is difficult to diagnose. The diagnosis is ultimately based on the presence of plasma cells in the endometrial stroma on histopathological examination. Literature on the reproducibility of the diagnosis of chronic endometritis is lacking. Therefore, the aim of the current study was to assess the interobserver agreement of two pathologists in diagnosing chronic endometritis in asymptomatic, infertile patients. METHODS: In the context of a randomized controlled trial, an endometrial biopsy was taken during a screening hysteroscopy prior to IVF. All endometrial samples were independently examined by two pathologist. The slides diagnosed with chronic endometritis were replenished with a random sample of the remaining slides up to a total of 100, then exchanged between the two pathologists and reassessed. RESULTS: Of the 678 patients who underwent hysteroscopy, 19 patients were diagnosed with at least possible chronic endometritis (2.8%). Perfect agreement between the pathologists, before and after inclusion of 13 slides with additional immunohistochemistry staining, was found in 88 and 86% of reviews, respectively. The interobserver agreement was substantial, with kappa-values of 0.55 and 0.66, respectively. CONCLUSIONS: The interobserver agreement in diagnosing chronic endometritis in asymptomatic infertile patients was found to be substantial. Although the diagnostic reliability is sufficient with the methods in the present study, the low prevalence and unknown clinical significance of endometritis warrants further study.

Progressive derailment of cell cycle regulators in endometrial carcinogenesis.

BACKGROUND: Derailments of the control mechanisms of the cell cycle can initiate carcinogenesis, and play a role in progression to cancer. AIM: To explore the expression of cell cycle proteins in normal, premalignant and malignant endometrial lesions representing the morphologically well defined stepwise model of human endometrial carcinogenesis METHODS: Observational study. Paraffin-embedded specimens from inactive endometrium (n = 16), endometrial hyperplasia (n = 23) and endometrioid endometrial carcinoma (n = 39) were stained immunohistochemically for cyclin A, cyclin B1, cyclin D1, cyclin E, cdk2, p16, p21, p27, p53 and Ki67(MIB-1)). Differences in expression between the tissues, and correlation with classical prognostic factors for the carcinomas were analysed. RESULTS: Expression of cyclin A and Ki67 gradually increased from normal through hyperplasia to carcinoma, indicating that proliferation increases over the carcinogenetic spectrum. cdk2, p16 and p21 gradually increased from normal through hyperplasia to carcinoma, indicating their potential importance in both early and late carcinogenesis. Cyclin D1, cyclin E and p53 especially increased and p27 decreased from hyperplasia to carcinoma, underlining their role in late carcinogenesis. In cancers, expression of cyclin A, p53 and Ki67 was positively correlated to grade, and cyclin A was positively correlated with cdk2, p21, Ki67, cyclin E and p53. CONCLUSION: During (endometrioid) endometrial carcinogenesis, there is increasing proliferation paralleled by progressive derailment of cyclin B1, cyclin D1, cyclin E, p16, p21, p27, p53, and cdk2, indicating the importance of these cell cycle regulators in endometrial carcinogenesis.

p16 is consistently expressed in endometrial tubal metaplasia.

BACKGROUND: Cell cycle proteins and HIF-1alpha with downstream factors are often abberrantly expressed in (pre)neoplastic tissue. METHODS: Paraffin-embedded specimens of inactive endometrium with TM (n=15), ovarian inclusion cysts (n=6), cervix with TM (tubal metaplasia) (n=3), Fallopian tubes (n=7), cycling endometrium (n=9) and a ciliated cell tumor of the ovary were stained for p16 and LhS28. 39 Endometrioid endometrial carcinomas and 5 serous endometrial carcinomas were stained for p16. Additionally, inactive endometrium (n=15) was immunohistochemically stained for p21, p27, p53, cyclin A, cyclin D1, cyclin E, HIF-1alpha, CAIX, Glut-1 and MIB-1. RESULTS: A mosaic pattern of expression of p16 was seen throughout in all cases of endometrial TM (15/15), in 2/6 of the ovarian inclusion cysts with TM, in all (3/3) cervical TM and focal in 5/7 of Fallopian tube cases. Mosaic expression was also seen in a ciliated cell tumor of the ovary and in 18/39 of endometrioid endometrial carcinomas, and diffuse p16 expression was seen in 5/5 serous carcinomas. In comparison with normal endometrium, TM areas in the endometrium showed significantly increased expression of HIF-1alpha, cyclin E, p21 and cyclin A, and decreased expression of p27. Membranous expression of CAIX and Glut-1 was only seen in TM areas, pointing to functional HIF-1alpha. CONCLUSION: As p16 is consistently expressed in TM, less and only patchy expressed in the normal Fallopian tube, is paralleled by aberrant expression of cell cycle proteins, HIF-1alpha, CAIX and Glut-1 and resembles the pattern of p16 expression frequently seen in endometrial carcinomas, we propose endometrial TM to be a potential premalignant endometrial lesion.

Lymph node recurrence following stage IA vulvar carcinoma: two cases and a short overview of literature.

Stage IA vulvar carcinoma is not supposed to metastasize to the lymph nodes. Therefore, it is assumed that these lesions can be safely treated by less aggressive methods than macroinvasive carcinomas. However, in this case report, two patients are described who had vulvar lesions with a depth of invasion of less than 1 mm and developed lymph node metastases in the groin despite radical wide local excision of their lesions. Both the patients underwent lymphadenectomy and received postoperative radiation therapy on the groins. Neither of the two patients died of vulvar carcinoma. Thus, we conclude that vigilance for the occurrence of lymph node metastases remains necessary after radical, local excision in stage IA vulvar cancer. However, this case report also shows that adequate treatment of groin node metastases can result in a very good long-term survival.

Irregularly shaped inclusion cysts display increased expression of Ki67, Fas, Fas ligand, and procaspase-3 but relatively little active caspase-3.

Human ovarian cancers are thought to arise from sequestered ovarian surface epithelial (OSE) cells that line the wall of inclusion cysts. Nevertheless, the early events toward neoplasia are not well understood. In this study, immunoreactivity for apoptotic proteins in human OSE of control and tumor ovarian sections was examined. Ki67, a marker for cell proliferation, was generally absent in the flat-to-cuboidal OSE cells on the ovarian surface and in regularly shaped inclusion cysts. Fas, Fas ligand, and caspase-3, components of the apoptotic pathway, were also largely absent. Ki67, Fas, Fas ligand, and procaspase-3 expression, though not active caspase-3 expression, was more frequently observed in epithelial cells lining irregularly shaped inclusion cysts, particularly in the columnar and Müllerian-like OSE cell types that resembled ovarian tumor OSE cells. Immunoreactivity for these factors as well as active caspase-3 was found frequently in ovarian tumors. We postulate that the appearance of the Fas system and its related proteins in sequestered columnar OSE cells of irregularly shaped inclusion cysts may contribute to balance cell growth with cell death, although little active caspase-3 expression was observed. Further studies are required to identify whether inhibition of apoptosis in inclusion cysts is an early event in ovarian carcinogenesis.

Sclerosing polycystic adenosis: a case report.

About 70 to 80 percent of all salivary gland neoplasms, the majority of which are benign, arise in the parotid gland. Sclerosing Polycystic Adenosis (SPA) is a relatively unknown and newly described entity that is considered to be benign in nature. A 55-year-old patient was treated for SPA in our hospital. The diagnostic work-up consisted of Magnetic Resonance Imaging (MRI), Fine Needle Aspiration Cytology (FNAC) and histological examination. However, in our case, both the cytological appearance, which usually has a high accuracy in discriminating benign from malignant lesions, and the appearance on MR images, mimicked a malignant tumour. This case report illustrates the importance of an adequate histological confirmation of the work-up diagnosis.

Treatment of metastatic invasive moles in two husband-side sisters-in-law. Case reports and review of literature.

PURPOSE OF INVESTIGATION: The treatment of "high risk" persistent trophoblastic disease (PTD) consists of poly-chemotherapy. This policy probably will lead to overtreatment of some patients. Also, familiar molar pregnancies through the paternal line are unknown in the literature up till now. METHODS: We describe two cases of "high risk" PTD in two husband-side sisters-in-law, in which poly-chemotherapy was stopped after histology became available and showed invasive metastatic mole. CONCLUSION: It should be stressed that treatment decisions should be made based on the concept of "high" or "low" risk PTD, but if histology becomes available, chemotherapy might be less aggressive in cases of invasive mole. If invasive mole could be familiar through the paternal line remains unclear with the current knowledge of genetics in trophoblastic disease.

Identification of sentinel lymph nodes in vulvar carcinoma patients with the aid of a patent blue V injection: a multicenter study.

BACKGROUND: The aim of this multicenter study was to investigate the feasibility and negative predictive value of sentinel lymph node detection with blue dye in vulvar carcinoma patients. METHODS: In patients with squamous cell carcinoma of the vulva without suspicious groin lymph nodes, patent blue V was injected intradermally shortly before surgery. Routine groin lymph node dissection and radical vulvectomy were performed. During the surgery, blue lymph vessels and lymph nodes were identified, and the blue lymph nodes were sent separately for histologic examination. The negative predictive value of the blue lymph nodes for the absence of metastases was assessed by histologic examination of the groin lymph node specimens. RESULTS: Fifty-one patients in whom 93 groin lymph node dissections were performed were entered. One or more blue lymph nodes were detected in only 52 groins (56%). Nine (17%) of these were tumor positive, and 6 blue lymph nodes were the only tumor positive lymph nodes in the specimen in which they were found. There were two false-negative blue lymph nodes. The negative predictive value was 0.953. CONCLUSIONS: It was shown in this multicenter study that sentinel lymph node detection in vulvar carcinoma patients with blue dye only is not feasible because its negative predictive value is too low. Further studies involving the use of a combination of radioactive labeled technetium and blue dye are warranted.

Undetectable serum thyroglobulin in a patient with metastatic follicular thyroid cancer.

The case of a 54-year-old woman with metastatic follicular thyroid cancer and undetectable serum thyroglobulin is presented. Many years after the patient had a subtotal thyroidectomy for a large goiter that had no clear evidence of malignancy, metastatic bone disease developed. When the bone metastases were detected and during the follow-up period, serum thyroglobulin values remained undetectable, but radioiodine uptake in the metastases was abundant. This case indicates that the combination of 1-131 scintigraphy and serum thyroglobulin values is superior to the measurement of serum thyroglobulin alone in detecting well-differentiated, metastatic thyroid cancer.

Detection of malignant breast tumours in dense breast tissue: results of 99mTc-tetrofosmin scintimammography related to surgery.

AIMS: To assess the contribution of 99mTechnetium tetrofosmin (99mTc-TF) scintimammography for staging of breast lesions in patients with a suspicious or non-diagnostic mammogram to reduce unnecessary surgical procedures in future. METHODS: Fifty patients with suspicious physical examinations and/or mammography underwent 99mTc-TF breast imaging. RESULTS: Scintimammography with 99mTc-TF was positive in 37 patients (36 true positive, one false positive) and negative in 13 patients (12 true negative, one false negative). The detection of a malignant tumour by 99mTc-TF was independent of the density of the breast tissue. In 33 patients with a malignant breast tumour 99mTc-TF was diagnostic with respect to axillary status, but in four out of 19 patients with a histologically positive axillary lymph node status, tumour involvement remained undetected by scintigraphy. Moreover, in four patients, scintimammography revealed an additional discrete area of increased 99mTc-TF uptake, which proved to be second primary breast cancers. CONCLUSIONS: 99mTc-TF scintimammography appears to be an accurate diagnostic test in patients with a symptomatic breast lesion and a non-diagnostic mammogram, also in those patients with dense breast tissue. This procedure may also have potential for the detection of second primary breast cancers in an early stage.

Biochemical and histological effects of vaginal estriol and estradiol applications on the endometrium, myometrium and vagina of postmenopausal women.

Estrogen and progesterone receptors in the cytosol (ERc, PRc) and estrogen receptors in the nuclear compartment (ERn) were measured in the endometrium, myometrium and vagina of 29 postmenopausal women who underwent hysterectomy. The effects of vaginal estriol (0.5 mg daily) compared to 17 beta-estradiol (0.05 mg daily) therapy on these receptor levels were studied. In addition, the endometrium was examined by light microscopy for estrogenic stimulation. We found biochemical and histological signs of estrogenic stimulation in all three tissues after estradiol as well as estriol therapy. In the vagina the effect of both estrogens on the ERc concentration was different from that in the endometrium and myometrium. The effects of estradiol and estriol on the ERn were comparable in all three tissues. The PRc levels increased significantly in all tissues after estrogen therapy; in the myometrium it was significantly higher after estriol than after estradiol applications. In conclusion, there were no clear differences between vaginal estradiol and estriol medication with regard to the effects on receptor levels in vaginal and uterine tissues. In the histological studies at the light microscopy level similar signs of estrogen stimulation of the endometrium were found following estradiol and estriol medication.

Primary extranodal CD3O-positive T-cell non-Hodgkins lymphoma of the oral mucosa. Report of two cases.

CD3O-positive extranodal T-cell lymphomas predominantly occur in the skin, and they are characterized by a rather indolent course with spontaneous regression of individual lesions. Their occurrence in the oral mucosa is rare and not well documented. Two cases are reported, one occurring in the oral mucosa in a 61-year-old man and originally presenting as a multifocal eosinophilic ulcer of the mucous membrane, and the other one mimicking periodontitis, occurring in the maxillary gingiva of a 75-year-old woman.

Nasal T-cell lymphoma: a clinicopathological and immunophenotypic analysis of 13 cases.

Thirteen cases of nasal lymphomas with T-cell or natural killer (NK)-cell phenotype were studied, with attention to clinical presentation and follow-up, the presence of Epstein-Barr virus (EBV) using in situ hybridization (EBER), the immunophenotype, and the presence of cytotoxic granules. All but two patients presented with stage I disease. In three cases local progression resulted in involvement of the central nervous system. When dissemination occurred, this was predominantly to extranodal localizations, in two cases to the skin. Response to therapy was highly variable, but patients treated with radiotherapy with or without additional chemotherapy had a better prognosis than patients treated with initial chemotherapy alone. All lymphomas were associated with EBV, and most cases showed cytotoxic features, ten of which were CD56 positive. In eight cases a T-cell origin was proven, but in five cases a possible NK-cell origin could not be excluded. No clinical differences were seen between true T-cell lymphomas and possible NK-cell neoplasms. Nasal T-cell lymphomas should be considered as a distinct clinicopathological entity, strongly associated with EBV, and with cytotoxic features in most cases. No prognostic parameters were detected to predict dissemination and response to therapy.