Then, all patients underwent ultrasound scanning for estimation of ovarian measurements that were represented as the maximal ovarian diameter (MOD) and for ascites grading if present. Ultrasound scanning is performed using a 5 megahertz vaginal probe , otherwise a 3.5 megahertz, 2.6 megahertz or 5megahertz abdominal probe is used if visualization using a vaginal probe is compromised. Ascites is graded according to the quantity of fluid accumulation in the peritoneal cavity with the patient in the anti-Trendelenburg position.