disease has location reproductive system cancer gonadal disorder mixed germ cell-sex cord-stromal tumor blastoma malignant mixed neoplasm sex cord-stromal tumor gonadoblastoma DOID:3301 UMLS:C0206661 MESH:D018238 gonad blastoma NCIT:C3754 MEDGEN:104912 gonadoblastoma A mixed germ cell/sex cord-stromal tumor characterized by the presence of large germ cells which resemble seminoma cells and small cells which resemble Sertoli or granulosa cells. It occurs in the testis and the ovary and is identified in children and adults. It is often associated with gonadal dysgenesis and abnormal karyotype. ONCOTREE:OGBL ICDO:9073/1 MONDO:0010768 gonad