Trophoblastic Tumor, Placental Site

**Definition:** 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.

**Tree numbers:** - C04.557.465.955.207.875 - C04.557.470.200.025.455.875 - C04.850.908.208.875 - C12.050.703.720.949.208.875

**Synonyms:** - Placental-Site Trophoblastic Tumor - Trophoblastic Tumor, Placental