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A 35-year-old man attended our hospital with complaining of epigastric pain and vomiting. He was diagnosed with bowel intussusception based on the target sign revealed in the upper jejunum by abdominal computed tomography. However, the cause of the intussusception was not clear. Insertion of an endoscope into the jejunum revealed prominent edema in the upper part of the jejunum, and Anisakis simplex was identified at the site and removed. Symptoms rapidly improved after endoscopic treatment. We report this case because surgery was avoidable and because we are aware of no previous reports of small intestinal intussusception caused by anisakiasis that has been diagnosed and treated endoscopically.

A 52-year-old man was referred to our hospital complaining of right lower abdominal pain. He was diagnosed with appendicitis complicated with a liver abscess and underwent an appendectomy. After antibiotic treatment following surgery, the liver abscess penetrated the right lung, which was considered to be drained from a hepatobronchial fistula. Due to the effect of drainage, the liver abscess immediately improved and the patient was subsequently discharged.