Incidentally detected sigmoidovesical fistula in a case of rectosigmoid cancer detected on FDG PET-CT.

Enterovesical fistulas are complications of advanced pelvic malignancies, repeated diverticulitis, and rare conditions like Crohn disease. They are difficult to demonstrate on conventional imaging and often are the source of recurrent urinary tract infections. An interesting case of sigmoidovesical fistula secondary to advanced rectosigmoid cancer is described in this case report.