Serous papillary cystadenoma of borderline malignancy arising in the broad ligament is extremely rare. We report the case of a 28-year-old female with a cystic mass in the broad ligament, who underwent complete excision of the mass, right salpingo-oophorectomy, omentectomy and multiple peritoneal biopsies. Pathology showed a serous papillary cystadenoma of borderline malignancy of the broad ligament, without peritoneal and omental involvement. A review of the literature about this rare pathologic condition is reported.