Malignant Thymoma

**Semantic type:** Neoplastic Process

**Definition:** A thymoma that has an aggressive clinical course (capsular invasion, infiltration of the surrounding tissues) and can metastasize. Although any morphologic subtype of thymoma may eventually have a malignant clinical course, this term is most often associated with thymoma types B3 and C.

**Synonyms:** - THYMOMA, MALIGNANT