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Background  An intro-abdominal hernia through the lesser omentum is a rare but severe condition that can cause intestinal obstruction and other life-threating complications. Until now, only a handful of cases have been reported worldwide. The diagnosis of lesser omental hernia remains challenging for emergency surgeons because of the unspecific symptoms. Therefore, there is a need for a better understanding of the characteristics of this condition.    Case presentation  In this report, we described the case of a 73-year-old female patient who was diagnosed with a lesser omental hernia caused by previous total colectomy. The patient underwent emergency surgery, and the intraoperative findings revealed a 200-cm segment of the small intestine was herniated through a defected lesser omentum (approximately 3 × 4 cm) from the lesser retrogastric curvature of the stomach. Besides, we summarize the specific abdominal computed tomography (CT) findings of lesser omental hernia by reviewing the literature.    Conclusion  The lesser omental hernia is extremely rare but can cause serious complications. The cause of lesser omental hernia can be congenital or acquired. Careful examination of the small omentum before the closure of the abdomen is expected to reduce the occurrence of these abdominal surgery-associated complications. The specific features of abdominal CT in cases of lesser omental hernia, which are summarized in this article, can help other clinicians to obtain accurate diagnoses of lesser omentum hernia in the future.

An extremely rare case of lesser omental hernia in an elderly female patient following total colectomy