We describe a case of renal leiomyoma in a 21-year-old woman who prese
nted with flank pain and hematuria. Urographic and computed tomographi
c (CT) studies revealed a large right renal mass with polypoid outgrow
th protruding into the renal pelvis. Cortical renal leiomyoma with thi
s radiographic manifestation is extremely rare.