Case Report

Xanthogranulomatous Pyelonephritis of a Lower Pole Moiety in a Duplicated Collecting System Kidney

Figure 2

Preoperative cystoscopy with bilateral retrograde pyelograms shows a bladder without congenital anomalies (yellow arrow), a classic “drooping lily” sign of the right lower pole moiety (red arrow), an independent left upper pole moiety without abnormalities (green arrow), and a left lower pole containing large UPJ calculi with perforation of its renal pelvis and leakage of contrast material into retroperitoneal space (blue arrow).