ABSTRACT
Introduction: Oncocytic carcinoma (OC) of salivary glandorigin is an extremely rare proliferation of malignant oncocyteswith adenocarcinomatous architectural phenotypes, includinginfiltrative qualities. To help clarify the clinicopathologicfeature of this tumor group, herein, we report a case ofoncocytic carcinoma arising from the salivary glands, togetherwith radiological and immunohistochemical observations.Case report: The tumor was reported in the parotid regionof a 50 year old female. The tumors were unencapsulatedand was seen invading into the nearby lymphatic tissues. Theneoplastic cells had eosinophilic granular cytoplasm and roundvesicular nuclei with prominent red nucleoli. Cellular atypiaand pleomorphism was mild. Immunohistochemistry reveleadDOG1 and p63 positivity. In summary, OC of salivary glandorigin is a high-grade tumor, often with local recurrence,regional or distant metastasis, diagnosis of which is based ona combination of clinical and histopathological features.Conclusion: Complete surgical excision is the treatment ofchoice while the role of radiotherapy or chemotherapy iscontroversial, and careful follow-up is necessary.
ABSTRACT
Context: The concept of epithelial–mesenchymal transition (EMT) in cancer origin, progression, and metastasis is of recent origin and not fully understood. So far, many cell culture studies have been done to investigate the role of EMT in epithelial ovarian cancer, but only a few human studies have been conducted. Aims: The aim of the study is to study the expression of E-cadherin and vimentin in serous and mucinous tumors of the ovary and to compare their expression in benign and malignant serous and mucinous ovarian tumors. Methods: This study was a prospective study done on 60 patients with a histological diagnosis of serous and mucinous ovarian malignancy. The study was conducted in the Department of Pathology and Department of Obstetrics and Gynaecology, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi. The expression of epithelial marker E-cadherin and mesenchymal marker vimentin was studied in each of the tumors. Statistical Analysis: Unpaired t-test/Mann–Whitney test, Chi-Square test/Fisher's exact test, and Kolmogorov–Smirnov test were used. Results: Of the total 60 cases included in the study, 30 benign and 30 malignant cases of serous and mucinous tumors were taken. Of the 30 benign cases, 22 cases (73.3%) were that of serous cystadenomas, whereas 8 (26.67%) cases were of mucinous cystadenomas. Among the malignant cases, 21 cases (70%) were serous surface epithelial ovarian carcinoma, whereas 9 (30%) were mucinous surface epithelial ovarian carcinoma. Subsequently, the malignant cases were graded according to their glandular differentiation. Immunohistochemistry was performed in each of the 60 cases. Conclusion: In the malignant cases with increasing grade of the tumor, a reduced expression of E-cadherin and an increased expression of vimentin were seen in the epithelial cells
ABSTRACT
Background: Extracranial head and neck schwannomas are rare tumors which are often clinically misdiagnosed. Preoperative diagnosis of these tumors is challenging but imperative for surgeons so as to avoid nerve damage during excision. Materials and Methods: Sixteen patients diagnosed with extracranial head and neck schwannomas over a period of 2 years were retrospectively analyzed. Clinical details including preoperative fine-needle aspiration cytology (FNAC) and/or computed tomography (CT)/magnetic resonance imaging (MRI) findings were retrieved. FNAC smears and formalin-fixed paraffin-embedded sections were evaluated. Results: Among these 16 tumors, 6 (37.5%) were located in the lateral aspect of neck, 4 (25%) in scalp, 2 (12.5%) in orbit, and one each (6.25%) in palate, tongue, submandibular gland and parotid gland. The mean patient age was 31.3 years. FNAC was performed in 14 cases, of which 8 cases (58.3%) showed features of benign nerve sheath tumor (BNST), two cases (14.2%) were inconclusive with possibility of mesenchymal lesion, two cases (14.2%) were inadequate, one case (8.3%) showed features suggestive of schwannoma, and a diagnosis of nerve sheath tumor inconclusive for malignancy was rendered in a single case. The sensitivity of FNAC in diagnosis of BNST was 71.4%. CT or MRI was performed in five cases, of which an accurate diagnosis was rendered only in one case of orbital schwannoma. Conclusion: Imaging has a limited role in the preoperative diagnosis of head and neck schwannomas owing to nonspecific radiological features. Cellular aspirate smears are helpful in accurate diagnosis even at unusual locations