Sonographic characteristics of ovarian cysts: in the aspiration group, mean size was 49 ± 10.7 mm, 18/26 cases of simple cyst with clear fluid; In surgical group, mean size was 46 ± 14 mm, 29/30 cases were complicated cysts invariably contains a fluid-debris level, a retracting clot, or septa and a cyst wall calcification.