A 38-year-old man with myotonic dystrophy who had undergone surgery for sigmoid volvulus was admitted with acute epigastric pain. Computed tomography (CT) showed an internal hernia of the ascending colon infiltrating the lesser sac via the Foramen of Winslow (Picture 1, ​,2).2). After fasting for half a day, the contents of the ascending colon reduced, and neither obstruction nor ischemia was observed (Picture 3). Five days later, herniation of the ascending colon had spontaneously recovered (Picture 4). Foramen of Winslow hernia is uncommon, accounting for 8% of all internal hernias; herniation of the ascending colon, as in this case, is quite rare (1). Our patient's high intra-abdominal pressure due to decreased intestinal peristalsis and intestinal dilatation resulting from myotonic dystrophy and abdominal surgery may have caused the disease. A pre-operative diagnosis is challenging, but CT findings can help determine the surgical strategy (2). Although most previous cases received surgery, our patient conservatively recovered.

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Picture 1.

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Picture 2.

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Picture 3.

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Picture 4.

Informed consent was obtained from the patient for publication of our information and images.

The authors state that they have no Conflict of Interest (COI).