Mucoepidermoid carcinoma of the thymus: a case report with emphasis on the differential diagnosis.

Primary thymic mucoepidermoid carcinoma (TMEC) is extremely rare and only a few cases have been reported in the literature. We describe the case of a TMEC in elderly man, with atypical morphological features that could lead potential diagnostic pitfall. Herein, we suggest a practical approach that may help guide pathologists in their differential diagnosis to distinguish TMEC from other thymic mimics.