Mixed Epithelial and Stromal Tumor of the Kidney

Abstract

Mixed epithelial and stromal tumor of the kidney (MEST) is a rare, recently described benign renal neoplasm that predominantly affects perimenopausal women. It is composed of dual components of epithelial and stromal cells, and the tumor is characterized by admixed cystic and solid growth patterns. Herein, we report on a case of MEST in a 35-year-old woman who presented with an incidentally found renal tumor. The patient has had no evidence of disease 4 years after the surgery. (Korean J Urol 2008;49:174-176)