A rare case report of Metaplastic Thymoma

Thymoma is the most common neoplasm derived from epithelial cells of thymus. Metaplastic thymoma is a rare histologic variant, characterized by a histologic biphasic growth pattern. Given the rarity of the cases, the few previous reports have focused only on morphologic and ultrastructural aspects of the tumor. This case report of metaplastic thymoma is presented for its rarity and potential for misdiagnosis.