Abstract
A 7-year-old male admitted due to right lower abdominal pain was found to have intraperitoneal free air on plain abdominal radiography and computed tomography. Abdominal ultrasound revealed that the tender spot located in the abdomen measured 2×3 cm in size. Under the diagnosis of perforated pan-peritonitis, an emergency operation was performed. A thumb-sized Meckel's diverticulum was found about 50 cm from the oral side of the ileocecal region. A 2-mm perforation was present at the bottom of the diverticulum resulting in pan-peritonitis. A partial resection of the ileum was performed. On gross examination, a fold in the inner wall was thought to be responsible for the finding resembling paper tablets that was observed on abdominal ultrasound. Microscopic examination of the resected specimen revealed ectopic gastric mucosa. It is difficult to diagnose pan-peritonitis due to perforation of Meckel's diverticulum, however, abdominal ultrasound was helpful for making an accurate preoperative diagnosis.
