seminoma https://www.malacards.org/card/seminoma ICD9:186.9 MONDO:0003001 UMLS:C0036631 seminoma, malignant MESH:D018239 ONCOTREE:SEM MEDGEN:11371 GARD:0023322 NCIT:C9309 DOID:4440 A radiosensitive malignant germ cell tumor found in the testis (especially undescended), and extragonadal sites (anterior mediastinum and pineal gland). It is characterized by the presence of uniform cells with clear or dense cytoplasm which contains glycogen, and by a large nucleus which contains one or more nucleoli. The neoplastic germ cells form aggregates separated by fibrous septa. The fibrous septa contain chronic inflammatory cells, mainly lymphocytes. seminoma SCTID:443675005 ICDO:9061/3 seminoma, pure malignant germ cell tumor germinomatous germ cell tumor