Brenner tumor of the ovary: CT and MR findings

Purpose: The purpose of this study was to determine the CT and MR character istics of Brenner tumors, rare epithelial neoplasms of the ovary. Method: CT and MR scans of eight pathologically proven Brenner tumors of th e ovary (seven benign, one malignant, and one associated with mucinous cyst adenoma) were retrospectively reviewed. The masses were analyzed for locati on, size, external configuration, internal architecture, enhancement patter n, presence of calcification and metastatic spread. Results: The patients' median age was 63 years (range 39-79 years), and the mean size of the tumors was 11.4 cm (7.5-17 cm). All tumors were unilatera l and had a well-defined margin. The mass was mostly solid in three, mostly cystic in one, and "mixed" solid and cystic in four cases. The tumors with cystic components (n = 5) were mostly multilocular in appearance (n = 4). All the solid components showed mild homogeneous enhancement on postcontras t CT and MRI. Extensive amorphous calcification within the solid component on CT was seen in five of six cases (83%). No characteristic findings discr iminating malignancy from benign Brenner tumor could be found. Conclusion: Extensive amorphous calcification in a solid mass or solid comp onent in a multilocular cystic mass is a characteristic finding of Brenner tumor of the ovary on CT and MRI.