We encountered a 39-year-old man who was given a diagnosis of solitary fibrous tumor and underwent radical cystoprostatectomy and urinary tract change (preparation of a neobladder). A small bowel obstruction appeared on postoperative day 12; intestinal radiography and abdominal CT revealed that the obstruction was caused by the left urinary tract. We re-operated on postoperative day 22 to release the obstruction. In the operative view, the left urinary tract was exposed to the left colic gutter and looped. One meter of small intestine had invaginated into the loop, but no significant bowel ischemia or gangrene was found. After releasing the internal hernia, we covered the exposed urinary tract with omental fat to prevent hernia recurrence. The postoperative course was uneventful. An internal hernia caused by the urinary tract is very rare.
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