Renocolic fistulas: complementary roles of computed tomography and direct pyelography.Abdom Imaging. 1997 Jan-Feb; 22(1):96-9.AI
Three patients with renocolic fistulas are presented. Antegrade or retrograde pyelography showed the fistula in one patient but was unsuccessful in two others. CT demonstrated perinephric inflammation extending to the colon, complex air-fluid collections within the kidney, or extension of renal contrast into the colon. CT and direct pyelography complement each other for the diagnosis of renocolic fistulas.