Kidney Mixed Epithelial and Stromal Tumor

**Semantic type:** Neoplastic Process

**Definition:** A rare, usually benign tumor that arises from the kidney. It belongs to the spectrum of mixed epithelial and stromal tumor family. It usually affects females. It is characterized by the presence of a biphasic pattern with tubular and cystic structures in a spindle cell stroma. Patients usually present with flank pain and hematuria.

**Synonyms:** - MEST - Mixed Epithelial Stromal Tumor of the Kidney - Renal Epithelial Stromal Tumor