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Choi, William W L; Lui, Y H; Lau, W H; Crowley, Peter; Khan, Afaq; Chan, John K C
The American journal of surgical pathology 27, Issue: 1Journal Article
We report two cases of primary thymic adenocarcinoma, a very uncommon neoplasm with limited information in the literature. Both patients were men (age 15 and 39 years). The first case was a mucinous carcinoma, a subtype of adenocarcinoma not previously recognized in the thymus. It comprised islands and strips of mucin-rich tumor cells floating in large pools of extracellular mucin. There was transition of carcinomatous epithelium to the attenuated epithelium of a thymic cyst. Immunostaining for high molecular weight cytokeratin furthermore highlighted in one area negatively stained tumor islands wrapped by positively stained residual thymic medullary epithelium, suggesting in situ origin of the carcinoma from the thymic epithelium. The second case was a papillary carcinoma with high nuclear grade and many psammoma bodies. It showed strong immunoreactivity for CD5 and did not stain for CA-125 as well as thyroid, pulmonary, and mesothelial markers. The findings in this study therefore broaden the morphologic spectrum of thymic adenocarcinomas to include a mucinous subtype. Review of the literature indicates that thymic adenocarcinomas usually arise from thymic cyst or type A thymoma, and the clinical outcome is variable.
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