卵巢上皮性肿瘤，是最常见的卵巢肿瘤。这样的浆液性或粘液性的肿瘤可能被上皮细胞包绕。图示浆液性囊腺瘤。在单个囊腔中充满了淡黄*色浆液。粘液性肿瘤充满富于糖蛋白的粘液，且多由多个大小不一的囊腔组成。20%的卵巢上皮瘤同时累及双侧卵巢。

This is a tumor of ovarian surface epithelium. These are the most common ovarian neoplasms. Such neoplasms may be lined by epithelium that is serous or mucinous. Pictured here is a serous cystadenoma. It was filled with pale yellow serous fluid in only a single cavity. Mucinous tumors are filled with sticky mucin and tend to be multiloculated. Benign epithelial ovarian tumors are bilateral in about 20% of cases.