Retroperitoneal Gastrointestinal Stromal Tumor

**Semantic type:** Neoplastic Process

**Definition:** A gastrointestinal stromal tumor that arises from the retroperitoneum. This is an extragastrointestinal tumor, meaning that it does not arise directly from the gastrointestinal tract.

**Synonyms:** - Retroperitoneal EGIST - Retroperitoneal Extragastrointestinal Stromal Tumor