A Rare Case of Mixed Type A Thymoma and Micronodular Thymoma with Lymphoid Stroma

Micronodular thymoma with lymphoid stroma (MNTLS) is a rare subtype of thymoma and accounts for only 1%–5% of all thymoma [1]. Histologically, MNTLS shows characteristic segregating epithelial components in rich lymphoid stroma. Though the histogenesis of MNTLS is not yet elucidated, it is postulated that type A thymoma and MNTLS are common in origin. Here we report a case of mixed thymoma composed of type A thymoma and MNTLS.