Cystic nephroma: a case report and review of the literature.

Background: The spectrum of cystic renal neoplasms includes both benign and malignant tumors and the order is as follows: benign multilocular cyst, multilocular cystic renal cell cancer and cystic renal cell cancer. Gross similarities among multicystic tumors of the kidney may cause conflict in the diagnosis and treatment of these lesions.

Results: We report a 53-year old male patient who presented with a mild persistent left flank pain and a painful left renal mass.