A rare case of ureteric involvement in xanthogranulomatous pyelonephritis associated with giant ureteric calculus: An unusual entity.

Xanthogranulomatous pyelonephritis (XGPN) is an uncommon chronic destructive granulomatous inflammation of the kidney with variable clinical and radiological presentation. Due to its similarities to other benign and malignant pathologies, a high index of suspicion is required for preoperative diagnosis, which will ensure appropriate management of this condition. The invasion into the surrounding structures such as pararenal spaces, psoas muscle, small bowel, diaphragm, lung or soft tissues has been reported. However, involvement of ureter is very rarely reported. We report a rare case of left-sided gross hydronephrosis with staghorn calculus with giant uretic calculi, postnephrectomy on the biopsy diagnosis of XGPN was made, which also revealed involvement of ureter also.