Unusual case of adenocarcinoma arising in endometriosis mimicking colorectal cancer in a young woman with a Müllerian anomaly

Abstract

To report a case of endometrioid adenocarcinoma that arose in endometriosis mimicking colorectal cancer in a young woman with a Müllerian anomaly. A case report. A university hospital. A 31-year-old, white nulligravida woman with a history of two previous laparoscopies for infertility and chronic pelvic pain. A solid rectosigmoid mass adherent to the left pelvic sidewall was found in this patient. The patient was subjected to an exploratory laparotomy followed by adjuvant chemotherapy. Surgical findings and histopathological observations are included in this report. Intraoperative and histologic examinations revealed endometriosis-associated colorectal cancer. Although a rare event, this condition should be considered in the diagnosis of women with a previous history of pelvic endometriosis, Müllerian malformation, abdominal pain, constipation, or rectal bleeding.