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Deep endometriosis (DE) is endometriotic tissue that invades the peritoneum by >5 mm. Surgery is the treatment of choice for symptomatic DE, and laparoscopic surgery is preferred over laparotomy due to better vision and postoperative pain. …

Introduction and importanceCarbohydrate antigen 19-9 (CA 19-9) can be increased in benign ovarian cysts, but extreme elevation is rare.Case presentationWe present a case of a mature cystic teratoma with extremely elevated CA 19-9 levels. Af…