A 23-year-old Japanese man presented with a history of sudden-onset right abdominal pain accompanied by nausea and vomiting. Contrast-enhanced CT showed a large cluster on the right side of the retroperitoneum, with most of the small bowel incarcerated. The patient was diagnosed with small bowel obstruction caused by a right paraduodenal hernia, and emergency laparoscopic surgery was performed. The large retroperitoneal cluster on the right side contained almost all segments of the small bowel, although the incarcerated bowel showed no evidence of volvulus or ischemia. The bowel was reduced, and the hernia orifice was closed. The patient made good progress and was discharged 7 days after surgery. We herein report an acute case of right paraduodenal hernia with small bowel obstruction that was successfully treated with emergency laparoscopic surgery. With an early preoperative diagnosis, laparoscopic surgery is appropriate for the treatment of right paraduodenal hernia.
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