Placental Site Trophoblastic Tumor

**Semantic type:** Neoplastic Process

**Definition:** A rare gestational trophoblastic tumor characterized by the presence of a diffuse cellular infiltrate composed of intermediate trophoblasts and cytotrophoblasts and by the absense of a significant population of syncytiotrophoblasts.

**Synonyms:** - PSTT - Placental Site Gestational Trophoblastic Tumor - Placental-Site GTT - Placental-Site Gestational Trophoblastic Neoplasm - Placental-Site Gestational Trophoblastic Tumor