MUC16 and Ascites: Interestingly, ∼ 10 to 15% of fibromas present with ascites, and less than 1% appear with both ascites and hydrothorax, known as Meigs syndrome, mimicking advanced ovarian cancer.7, 11Fibromas usually present as solid adnexal mass on transvaginal ultrasound and, if CA125 is elevated, suspicion of malignancy increases.