A Large Periureteral Lipoma Associated with Renal Lithiasis and Hydronephrosis.

A rare case of large periureteral lipoma in a 66-year-old woman is reported. The tumor measuring 16×7×7cm in size was located from the upper portion of the right ureter to the renal pelvis. It is considered that the severe hydronephrosis and renal lithiasis occurred as a result of stenosis in the upper urinary tract due to compression by the tumor. Although the differential diagnosis was difficult radiologically, the tumor was easily diagnosed as lipoma by hi stop athological investigation