The most common clinical presentation of ectopic pregnancy is vaginal bleeding in the first trimester and abdominal pain. The existence of a borderline tumor concomitant to ectopic pregnancy has not been described in the literature. The study reported a patient with ectopic pregnancy undergoing surgical treatment, and during the procedure was found an ovarian cyst. Histopathology confirmed the diagnosis of borderline serous cystadenoma. The article demonstrates the need for anatomic-pathological investigation of ovarian cysts, and especially the surgical care in the approach of ectopic pregnancy concomitant with these cysts, since it can occur in women who still desire children, aiming at the maintenance of fertility.