obsolete_Thymoma Type B3 true NCIT:C7997 http://purl.obolibrary.org/obo/MONDO_0006458 well differentiated thymic carcinoma epithelial thymoma malignant thymoma type B3 ICDO:8585/1 ICDO:8585/3 UMLS:C0279705 Replaced by Mondo term MONDO_0006458, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006458 thymoma, epithelial 3.88.0 EFO:1000583 Also known as well-differentiated thymic carcinoma, atypical thymoma, or epithelial thymoma, 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, it recurs frequently, and metastasizes in approximately 20% of the cases. DOID:7926 well-differentiated thymic carcinoma squamoid thymoma thymoma type B3 epithelial malignant thymoma atypical thymoma