Intestinal Duplication Cyst Misdiagnosed as Meckel's Diverticulum

An intestinal duplication cyst is a very rare congenital anomaly, with symptoms including abdominal pain, abdominal distention, intestinal bleeding, and hematochezia. Hematochezia can be caused by ectopic gastric mucosa, although there are other causes of infantile hematochezia; hence, an intestinal duplication cyst can be misdiagnosed as bowel intussusception or Meckel's diverticulum. Here, a case of an intestinal duplication cyst that was misdiagnosed as Meckel's diverticulum is reported. A 6‑month‑old girl was admitted to our hospital with recurrent and massive hematochezia. She was born at 39 + 1 weeks by cesarean section and weighed 4200 g. She had no underlying disease except for nonspecific tachypnea and cephalhematoma. She had experienced recurrent melena for 20 days 2 months earlier, but the hospital at which she was treated was unable to detect any specific abnormalities, and she was managed conservatively. She was admitted to the emergency department after experiencing massive hematochezia 3 times in a single day. Her diaper was wet with fresh blood with an estimated volume of 50 cc. She was pale, irritable, and inactive, and was found to have anemic conjunctiva and an initial hemoglobin level of 61 g/L. However, her vital signs were stable, and all other laboratory results were within the normal limits. Physical examination revealed no specific abnormality. A blood transfusion was administered, and detailed examinations were performed. Intussusception was suspected, so ultrasonography was performed, which failed to reveal any specific abnormality. When her condition had further stabilized, examinations to determine the cause of hematochezia were performed, starting with Meckel's scan. Five minutes after injection of Tc‑99m, continuous uptake was observed in the right mid‑abdomen, consistents with Meckel's diverticulum [Figure 1a], and computed tomography revealed a suspicious enhancing cystic structure at the ileum, which was also consistent with Meckel's diverticulum [Figure 1b]. By these findings, Meckel's diverticulum was diagnosed and surgery was performed during which intestinal duplication was discovered [Figure 1c]. The duplication was a tubular structure about 10 cm long and located in the terminal ileum, 30 cm above the cecum [Figure 1d]. It contained a 2 cm sized cystic mass surrounded by multiple lymph node enlargements. Small bowel resection and anastomosis were performed. Water intake was permitted on the 1 st postoperative day, milk and baby food intake were gradually allowed. She was discharged without any complications, and no problems were noted during the 6‑month follow‑up period. Gastrointestinal bleeding of unknown cause is very difficult …