Mediastinal Mature Teratoma

**Semantic type:** Neoplastic Process

**Definition:** An extragonadal mature teratoma that arises from the mediastinum. It is usually encapsulated and characterized by the presence of unilocular or multilocular cysts. The cysts can contain clear fluid, mucoid material, sebaceous debris, fat, hair, cartilage, and rarely teeth or bone.

**Synonyms:** - Mature Mediastinal Teratoma - Mature Teratoma of Mediastinum - Mature Teratoma of the Mediastinum