Finally, the last category of neoplastic cysts include malignant ovarian tumours, like serous or mucinous cystadenocarcinomas, which develop from surface ovarian epithelium, just like their benign counterparts.

最后一种赘生性肿恶性肿瘤，浆或黏癌，和良性的瘤相似，它们也由表面的上皮形成。