Fig. 2From: Xanthogranulomatous pyelonephritis: a focus on microbiological and antibiotic resistance profilesAxial CT scan images demonstrate obstructing left pelvic staghorn stone with associated grade IV hydronephrosis (Malek I) (a) and retroperitoneal collections surrounding the right kidney with a renal pelvic calculus (Malek III) (b)Back to article page