[An uncommon variant of CHORIOCARCINOMA. It is composed almost entirely of mononuclear cytotrophoblasts (TROPHOBLASTS). Because its secretion of hCG (CHORIONIC GONADOTROPIN) is low, a large tumor may develop before the hCG can be detected. ( MSH )]
UMLS (NCI) C0206666 Relation/PAR: Trophoblastic Neoplasm