Color Doppler Sonographic Features of a Brenner Tumor in Pregnancy

Brenner tumors, benign transitional cell tumors of the ovary, constitute approximately 3.1% of ovarian epithelial neoplasms.' The mean patient age is 50 years. Most tumors are 2 cm or smaller, but occasionally they are large and may exceed 10 cm.' Microscopically, the characteristic feature consists of sharply demarcated epithelial cell nests embedded in a dense fibrous stroma.' Hyalinized areas are common, and dystrophic calcification is present in 50% of cases, often in the hyalinized areas. 1 Sonographic findings of benign Brenner tumors have been described and consist of solid hypoechoic masses, with calcifications noted at times. 2,3 In a recent study pertaining to the sonographic and computed tomographic features of this tumor including 22 women with 25 ovarian Brenner tumors, 16 of 25 (64%) were found incidentally. 3 We present an unusual case of a Brenner tumor complicating pregnancy and a description of the color Doppler sonographic features of this tumor in pregnancy.