Infantile adenomyoma subclinically excreted into the patient's diaper.

Adenomyoma is a rare condition of the gastrointestinal tract, consisting of glandular structures lined by columnar or cuboidal epithelium and surrounded by smooth muscle bundles. The vast majority of adenomyomas of gastrointestinal tract have been reported to be located at the propyloric segment of the stomach and their localization in the bowel of infantile patients is considered rare. A review of the literature showed that 13 cases of infantile adenomyoma in the bowel have been reported. In the previous cases, intussusception was the most common complication of adenomyoma in the bowel and all cases underwent laparotomy. Here we describe an extremely rare case of infantile adenomyoma subclinically eliminated in the diaper. In addition, we performed immunohistochemical analysis to speculate on the origin of the adenomyoma.