NCIt definition : A rare carcinoma that arises from the peritoneum and resembles the malignant surface
epithelial-stromal tumors that arise from the ovary. Serous adenocarcinoma is the
most common histologic variant. It affects women almost exclusively. The diagnosis
of primary peritoneal carcinoma can be made only if both ovaries are not involved
by tumor, or, if the ovaries are involved, the tumor is confined to the ovarian surface
without invasion of the ovarian stroma and the peritoneal involvement is greater than
the ovarian surface involvement.;