Adenomyoma of the stomach presenting as localized peritonitis

Excerpt

Adenomyoma in the gastrointestinal tract represents a subtype of ectopic pancreas which can be found incidentally and is typically of no clinical importance. We describe herein an extremely rare case of gastric adenomyoma presenting as perigastric localized peritonitis. A 26-year-old woman who had undergone laparotomy for acute abdomen of unknown origin 21 months earlier was admitted to our hospital due to recurrent bouts of abdominal pain. Gastroduodenoscopy revealed a submucosal tumor with central umbilication in the gastric antrum, and computed tomography (CT) revealed a phlegmonous mass adjacent to the pylorus. The gastric lesion was suspected as the cause of inflammation and wedge resection was performed. The specimen demonstrated a subserosal mass and was microscopically composed of ectopic pancreaticobiliary-type ducts and gastric pyloric gland structures surrounded by smooth muscle without pancreatic acini, leading to a diagnosis of gastric adenomyoma. The postoperative course has remained uneventful for 3 years after surgery. …