[A case of squamous cell carcinoma of urinary bladder with an ileo-vesical fistula detected on bone scintigraphy].

A case of squamous cell carcinoma of the urinary bladder with concomitant radionuclide uptake in the colon observed on bone scintigram in a 76-year-old female is presented. This finding reflected retrograde flow from the bladder to the intestine and suggested the presence of vesicoenteric fistula. The patient's pelvis had been irradiated with 23.4 Gy before the bone scintigram, she had been complaining only of diarrhea and not of any characteristic symptoms of vesicoenteric fistula, such as pneumaturia and fecaluria. Further examination including cysternography revealed a fistulous communication between the bladder and the ileum. The size of the tumor decreased markedly after radiation, tumor invasion to the ileum and the fistulous communication were verified at surgery.