Synonyms

Thymoma, epithelial, NOS
Thymoma, atypical, NOS

Definitions

Thymus
ICD-O-3 topography code:	C37

This type of thymoma displays morphologic characteristics of a well-differentiated carcinoma. The majority of cases occur in the anterior mediastinum as Masaoka stage II or stage III tumors. It is almost always invasive, recurs frequently, and metastasizes in approximately 20% of the cases.