Ileal adenomyoma accompanied by primary peritonitis: report of a case.

We report herein the case of a 52-year-old woman who presented with severe abdominal pain and a 2-week history of a yellow vaginal discharge. An emergency operation was performed for localized peritonitis attributed to acute perforated appendicitis. There were no findings to indicate the cause of peritonitis, but by chance, a submucosal tumor was found in the ileum 2m from Bauhin's valve. Appendectomy and wedge resection of the ileum with the submucosal tumor were carried out. The peritonitis was considered to have been idiopathic from bacterial and molecular biological examination of the ascites. Pathological, immunohistochemical, and flow cytometrical findings of the resected ileal submocosal tumor indicated a diagnosis of ileal adenomyoma with no malignancy, which suggested metaplasia of the pancreaticobiliary to gastric epithelium.