Osteoclastic variant of anaplastic thyroid carcinoma: A case report of rare entity

Anaplastic thyroid carcinoma (ATC) is a rare, highly malignant thyroid tumor with dismal prognosis. Osteoclastic giant cell variant of ATC is extremely rare and is characterized by the presence of a large number of multinucleated giant cells resembling osteoclasts. We report here this unusual variant in a 67-year-old female with a history of long-standing goiter of 13 years duration. Histologically, many multinucleated osteoclast-like giant cells were seen accompanying the malignant spindle cell component. Despite extensive sampling, no evidence of differentiated thyroid malignancy could be elucidated

Analysis of epithelial-cadherin and human epidermal growth factor receptor 2/ expression in gastric carcinoma using immunohistochemistry.

Context: Gastric adenocarcinoma (GAC) is a common malignancy with high mortality-rate. Analysis of molecular markers could form a foundation for the future use of targeted therapies to reduce morbidity and mortality. Aims: To fi nd the prevalence and relation of epithelial cadherin (E-cadherin) and human epidermal growth factor receptor 2 (HER-2/neu) protein expression with histological type and grade of GAC using immunohistochemistry (IHC). Materials and Methods: A total of 100 cases of GAC diagnosed over a 2 year period were studied. Expression of E-cadherin and HER-2/neu was analyzed by IHC in relation to the histological type and grade. Results: Of the 100 cases of GAC studied, 11 revealed a loss of E-cadherin and over-expression of HER-2/neu was seen in 17 cases. Loss of E-cadherin was seen in 50% of signet ring-cell carcinomas but only in 8% of tubular and none of papillary and mucin-secreting GAC (P = 0.003). Of all the cases of tubular GAC with loss of E-cadherin expression, majority (71.4%) were Grade III (P = 0.04). Of all the tubular GAC cases with an over-expression of HER-2/neu, 20% and 67% were Grade I and II GAC respectively while only 13% were Grade III (P < 0.001). Conclusions: Although poorly-differentiated tumors show loss of E-cadherin, better-differentiated tumors over-express HER-2/neu protein. Signet ring-cell carcinoma is more likely to exhibit a loss of E-cadherin protein. Targeted therapy toward HER-2/neu in GAC should be considered. Novel therapy to block E-cadherin down-regulation is justified.

Polyphenotypic peripheral neuroepithelioma occuring in the foot: a case report.

Peripheral neuroepithelioma of the soft tissues is an uncommon member of primitive neuroectodermal tumors. Divergent differentiation and polyphenotypia is known in peripheral neuroepithelioma. We report one such recurrent peripheral neuroepithelioma in an infant which was detected at one month of age, in the foot. Microscopically, it showed tumor cells in nests and lobules with abundant Homer-Wright rosettes. Immunohistochemically, tumor cells were immunoreactive for neural markers but also displayed an aberrant myoid phenotype. The prognostic implications of this anomalous phenotype are unclear as of now, but documentation of this is necessary for possible future references.

Parathyroid adenoma with ectopic intrathymic parathyroid--a case report.

We report here a 14 year female who complained of a swelling in left flank, multiple fractures of the left humerus and tibia and a solitary nodule on the left side of the neck. Relevant investigations suggested a parathyroid adenoma. Surgical exploration of the neck was done. The adenoma was excised along with a suprasternal swelling. Histopathological examination confirmed the parathyroid adenoma of the mixed chief and oxyphil type. An incidental finding of an intrathymic parathyroid was also made. This article highlights the significance of detecting ectopic glands in abnormal locations. If undetected, these ectopic rests are subject to neoplastic change. They mimic a variety of neoplasms in these ectopic sites. Immunohistochemistry may aid in resolving this dilemma. They are also subject to functional activity and hence necessitate removal by the surgeon at the first sitting, having detected these abnormally located parathyroid tissues.