Mediastinal Choriocarcinoma

**Semantic type:** Neoplastic Process

**Definition:** An extragonadal malignant germ cell tumor that arises from the mediastinum and is composed of syncytiotrophoblasts, cytotrophoblasts, and intermediate trophoblasts. The prognosis is usually poor.

**Synonyms:** - Choriocarcinoma of Mediastinum - Choriocarcinoma of the Mediastinum