Most epithelial ovarian tumors are benign (noncancerous). There are several types of benign epithelial tumors, including serous adenomas, mucinous adenomas, and Brenner tumors. Cancerous epithelial tumors are carcinomas – meaning they begin in the tissue that lines the ovaries.
In this regard, what is a serous borderline tumor of the ovary?
Borderline Brenner tumors have atypical or malignant features of the epithelium but lack stromal invasion. Mixed epithelial borderline tumors are composed of an admixture of two or more of the five major cell types: serous, mucinous, endometrioid, clear cell, and transitional cell.