OP20.04: Imaging in gynecological disease: clinical and ultrasound features of ovarian clear cell carcinoma

To describe clinical and ultrasound features of ovarian clear cell carcinoma (CCC). Patients with a histological diagnosis of ovarian CCC, who had undergone preoperative ultrasound examination, were retrospectively identified from ten ultrasound centres. The masses were described using the terms of the IOTA group. In total, 152 patients with a diagnosis of pure CCC were identified. Median age of the patients was 53 (range, 28-92) years. 92/152 (60.5%) cases were FIGO Stage I and 41/133 (27%) were associated with endometriosis. On ultrasound, 53/152 (34.9%) CCCs were unilocular-solid, 63/152 (41.4%) multilocular-solid, and 36/152 (23.7%) were solid masses. No tumour was described as a unilocular or multilocular cyst. The median of the largest diameter of the lesion was 117 (range 25-310) mm. Papillary projections were present in 58/152 (38.2%) tumours and the median of the height of the largest papillation was 18 (range, 3-65) mm. 128/152 (84.2%) cases were unilateral and the ovarian crescent sign was described in 12/136 21.1% cases. Supporting information can be found in the online version of this abstract Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.