Pyeloduodenal fistula: report of 2 cases.

Pyeloduodenal fistula is a rare event, which can occur spontaneously or be caused by trauma. We present two such cases, of which, one was complicated by percutaneous nephrolithotomy for a right renal stone and the other occurred spontaneously from right renal and perirenal abscesses. Its etiology, pathogenesis, clinical manifestations, diagnosis and treatment are discussed. We emphasize that with the increasing use of interventional uroradiologic procedures, particularly percutaneous nephrolithotomy, we may encounter more traumatic pyeloduodenal fistulae.