We report a case of torsion of Meckel's diverticulum at the neck following an internal hernia due to mesodiverticularband. A 34-year-old man was admitted with a complaint of sudden onset of abdominal pain around the navel. Anabdominal CT scan showed an encapsulated fluid collection with an internal gas without a whirl sign of themesenterium. We performed laparotomy under the suspicion of intraabdominal abscess or localized torsion of thesmall intestine. An internal hernia without ischemia through a cord between the mesenterium and diverticulum wasfound. The internal hernia was easily released after dissection of the cord. The cord revealed a mesodiverticular bandon the tip of 7.5×4.5 cm Meckel's diverticulum on the ileum 90 cm proximal to the terminal ileum. The diverticulumhad become necrotic due to torsion clockwise by 360° at the neck. Segmental resection of the ileum including thediverticulum was performed. Torsion of Meckel's diverticulum at the neck is a relatively rare complication, and wefound 28 reports, including the present case, in Japanese literatures.
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