OBJECTIVE:To report the frequency and features of occult carcinomas and the incidence of subsequent cancers following risk-reducing salpingo-oophorectomy (RRSO) in BRCA mutation carriers. METHODS:257 consecutive women with germline BRCA mutations who underwent RRSO between January 1, 2000 and December 31, 2014 were identified in an Institutional Review Board approved study. All patients were asymptomatic with normal physical exams, CA 125 values, and imaging studies preoperatively, and had at least 12months of follow-up post-RRSO. All patients had comprehensive adnexal sectioning performed. Patient demographics and clinico-pathologic characteristics were extracted from medical and pathology records. RESULTS:The cohort included 148 BRCA1, 98 BRCA2, 6 BRCA not otherwise specified (NOS), and 5 BRCA1 and 2 mutation carriers. Occult carcinoma was seen in 14/257 (5.4%) of patients: 9 serous tubal intraepithelial carcinomas (STIC), 3 tubal cancers, 1 ovarian cancer, and 1 endometrial cancer. Three patients (1.2%) with negative pathology at RRSO subsequently developed primary peritoneal serous carcinoma (PPSC), and 2 of 9 patients (22%) with STIC subsequently developed pelvic serous carcinoma. 110 women (43%) were diagnosed with breast cancer prior to RRSO, and 14 of the remaining 147 (9.5%) developed breast cancer following RRSO. Median follow-up of the cohort was 63months. CONCLUSION:In this cohort, 5.4% of asymptomatic BRCA mutation carriers had occult carcinomas at RRSO, 86% of which were tubal in origin. The risk of subsequent PPSC for women with benign adnexa at RRSO is low; however, the risk of pelvic serous carcinoma among women with STIC is significantly higher.