Brenner tumour

A 60-year-old woman presented with a 2-month history of lower abdominal distention but no history of weight loss. Tumour markers including CA 125 and CA 19-9 were normal. Ultrasonography and subsequent MRI of the pelvis showed a large pelvic mass with mixed solid and cystic components apart from the uterus. The solid component showed low signal intensity on T2-weighted images, indicating an abundance of fibrous tissues (figure). At surgery, a mass with a well defined margin was found arising from the left adnexa. The specimen was confirmed to be a benign Brenner tumour—a rare epithelial neoplasm of the ovary. The patient had an uneventful postoperative course.