A case of Xanthogranulomatous pyelonephritis with spontaneous renocolic fistula.

Xanthogranulomatous pyelonephritis (XGPN) is a rare clinicopathological syndrome that is unique among the various inflammatory conditions of the kidney, and it closely mimics renal cell carcinoma, both clinically and radiologically. Approximately one third of XGPN cases have associated complications, such as abscess and fistulas, although the latter is much less common. Spontaneous renocolic fistulas of non-tubercular origin are also rare, especially in Asia.