Thymoma

Definition

A neoplasm arising from the epithelial cells of the thymus. Although thymomas are usually encapsulated tumors, they may invade the capsule and infiltrate the surrounding tissues or even metastasize to distant anatomic sites. The following morphologic subtypes are currently recognized: type A, type B, type AB, metaplastic, micronodular, microscopic, and sclerosing thymoma. Thymomas type B are further subdivided into types B1, B2, and B3. Thymoma type B3 usually has the most aggressive clinical course.

Also known as primary thymic epithelial neoplasm, primary thymic epithelial tumor, primary thymic epithelial tumour, thymoma, thymoma (disease) — per MONDO

Also identified as

• DOID 3275 per MONDO
• ICD9 239.89 per MONDO
• MESH D013945 per MONDO
• NCIT C3411 per MONDO
• Orphanet 99867 per MONDO
• SCTID 444231005 per MONDO
• UMLS C0040100 per MONDO

Affected Organs