Strangulated Small-bowel Obstruction due to Transmesosigmoid Hernia Diagnosed with Multidetector Computed Tomography: A Case Report

Transmesosigmoid hernia (TMSH), an emergency abdominal condition, is a type of internal hernia (IH) that involves the sigmoid mesocolon; its clinical symptoms are non-specific, so clinically its preoperative diagnosis is usually difficult. Here, we report a case of TMSH in which multidetector computed tomography (MDCT) clearly showed penetration of the small-bowel with its mesenteric fat tissue and mesenteric vessels through a complete defect in the sigmoid mesocolon. These MDCT findings accurately reflected the direct findings of this rare type of IH, so we were confident in the preoperative diagnosis.