2026 年 108 巻 1 号 p. 100-102
A 21-year-old woman experienced intermittent abdominal pain for one year. The patient presented with epigastric pain and nausea. Contrast-enhanced abdominal CT revealed small bowel intussusception caused by a polypoid jejunal lesion. As no signs of peritoneal irritation or intestinal necrosis were observed, the patient was managed conservatively. Small bowel endoscopy resulted in spontaneous reduction of the intussusception and identified a 30 mm pedunculated polyp (type Ip) located 20 cm distal to the ligament of Treitz. Given the risk of recurrence, elective polypectomy was performed using single balloon enteroscopy after placement of a detachable snare. The patient showed no features of Peutz-Jeghers syndrome. Histopathology revealed non-atypical glandular epithelium with clear cytoplasm and arborizing smooth muscle bundles, consistent with a Peutz-Jeghers-type polyp.