Mixed epithelial stromal renal tumor with dystrophic ossification: a case report and literature review

A 25-year-old female presented with worsening right flank pain and a 9 year history of a slow growing 4 centimeter calcified renal mass. The lesion was resected by laparoscopic partial nephrectomy revealing a mixed epithelial and stromal tumor (MEST). This tumor has unusual features including the extensive amount of dystrophic calcification and the young age at presentation. Herein, we present a focused review of the literature regarding MESTs, as well as a discussion of calcified renal mass management. We conclude that laparoscopy may be utilized to safely perform nephron sparing surgery for select, calcified renal masses.