Abstract
An 81-year-old man who was undergoing cardiac treatment as an inpatient suddenly complained of nausea and abdominal pains. An abdominal X-ray showed the small intestine was dilated throughout the abdomen. Enhanced computed tomography revealed the small intestine was dilated, and we could not locate the point of obstruction. We used a long tube, but we could not treat his small intestinal obstruction. Therefore, we performed an operation for a small intestinal obstruction and found the cause of his small intestinal obstruction to be an intramesosigmoid hernia. His ileum had become lodged in the hole of the right lobe of the sigmoid mesentery. However, no ischemia of the ileum was found, and therefore there was no need to resect his small intestine. After this treatment, there was no further recurrence.
