obsolete_Thymoma true primary thymic epithelial tumor UMLS:C0040100 ICD10:D38.4 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. MedDRA:10043670 ICD10:D15.0 DOID:3275 Orphanet:99867 thymoma EFO:1000581 thymoma (disease) ICDO:8580/1 ONCOTREE:THYM ICD9:239.89 Replaced by Mondo term MONDO_0006456, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006456 THYM 3.88.0 SCTID:444231005 thymoma (disease) HP:0100522 NCIT:C3411 primary thymic epithelial neoplasm http://purl.obolibrary.org/obo/MONDO_0006456