Ovarian mass的用法和樣例：
例句
- The diagnosis is made histopathologically, and the differential diagnosis between benign and malignant ovarian tumors cannot be made until operation.
診斷依靠組織病理，良惡性卵巢腫瘤的鑒別診斷只有通過手術才能確定。 - Women who had used estrogens combined with continuous progestins did not appear to have an increased risk of ovarian cancer.
使用雌激素並連續服用孕酮的婦女，發生卵巢腫瘤的危險率並未增加。
