Renal sinus varix: an additional differential diagnosis of a renal hilar mass

Renal sinus varix of the left kidney in a patient with circumaortic left renal vein is described. CT appearance of the varix resembled parapelvic cyst except that the varix did not displace or stretch the collecting system. The venous phase of left renal arteriography disclosed its nature. Renal sinus varix should be added to the differential diagnoses of renal hilar mass.