Rectal endometriosis.

摘要

A 43-year-old woman was referred with a diagnosis of rectal cancer, although 5 biopsy specimens taken endoscopically reportedly were negative for carcinoma. Barium contrast radiography demonstrated extrinsic compression in the region of the rectosigmoid junction. At colonoscopy with a magnifying videoendoscope, a polypoid mass with a reddish-nodular surface was noted in the rectum. Magnifying chromoendoscppy(0.2% indigo carmine) disclosed a type I pit pattern (Kudo classification), thereby excluding a diagnosis of rectal cancer. These findings raised a suspicion of a submucosal mass or compression by an extrinsic mass. Accordingly, deeper biopsy specimens were obtained. On histopathologic evaluation of the specimens, endometrioticglands and endometrial-type stroma were detected in the submucosal layer (D; H&E, orig. mag.X200). A diagnosis was made of endometriosis with rectal involvement.