Masquerading as Sigmoid Adenocarcinoma: A Unique Presentation of High-Grade Serous Carcinoma Arising from Endometriosis

摘要

Endometriosis is a common disease. Malignant transformation of endometriosis is rare and has been documented at various anatomical locations. Here, we report a case of primary serous carcinoma with neu-roendocrine features arising in the background of colonic endometriosis. The patient is a 78-year-old African-American female who presented with rectal bleeding concerning for colorectal cancer. This case illustrates two main points. First, there is benefit to complete removal of ectopic endometrial tissue at the time of index surgery. Second, consideration should be given to serous adenocarcinoma in the work up for a colonic mass in a patient with a history of endometriosis.