Mass in the Renal Pelvis

hage_16a_n.jpg to hage_16e_n.jpg: IVU and operative findings in a 13.6-year-old boy with recurrent hematuria and abdominal and flank colics. hage_16a_n.jpg: The IVU shows a dilatation of the left renal pelvis. An irregular filling defect at the level of the funnel-shaped pyeloureteric junction is recognizable. hage_16b_n.jpg: After wash-out of the contrast from the pelvis the filling defect continues into the ureter. hage_16c_n.jpg: Operative findings of the opened pyeloureteric junction; an intraluminal lobulated mass is visible. hage_16d_n.jpg: It is possible to luxate partially the mass out of the lumen; the mass has tentacled processi. hage_16e_n.jpg: The tumor which has been removed from the insertion at the pyeloureteric junction. hage_16a_n.jpg to hage_16e_n.jpg: The diagnosis is a benign tumor of the urinary tract; these polyps are mainly located either at the pyeloureteral junction, in the bladder, or in the posterior urethra. In addition to hematuria, abdominal and flank pain (intrinsic pyeloureteric junction anomaly; compare chapter 'Urinary tract infection') or voiding disorders (site of the polyps in bladder or urethra; compare chapter 'Voiding disorders') may occur. In case of a pyeloureteric junction anomaly with an irregular filling defect on x-ray, always a polyp has to be considered. In the reported case a plastic reconstruction of the pyeloureteric junction has been performed because of the long-distance involvement of the urinary tract and the long-standing pelvic dilatation.