A case of a pediatric intraabdominal hemorrhage caused by anomalous congenital band

We report a case of pediatric idiopathic intraabdominal hemorrhage due to anomalous congenital band originated from the mesenterium. A 14-year-old male admitted with severe lower abdominal pain was found in computed tomography (CT) to have ascites in the pelvic space and an appendix that was not identifiable. Emergency laparoscopy found mild appendicitis and bloody ascites. Abnormal string structure between the ileal mesenterium and the cecum thought to have caused abdominal bleeding necessitated appendectomy and resection of the string. The patient was discharged on postoperative day 8. Histopathological examination showed blood vessels and nerve plexi, which indicated anomalous congenital band. We report this case due to the rarity of pediatric idiopathic intraabdominal bleeding caused by anomalous congenital band.