Peritoneal epithelial lesions associated with proliferative serous tumours of ovary

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Abstract
The peritoneal epithelial lesions in 40 cases of proliferating ovarian serous tumor are described. The lesions were varied and of both neoplastic and non-neoplastic form. The most common was serous tumor similar to that in the associated ovarian neoplasm. Tumor of this type was present in some or all of the peritoneal lesions in 77.5% of cases. In nearly 2/3 the tumor was superficial; in the rest it invaded omentum. Occasionally, the infiltrating tumor was poorly differentiated. Benign tubular lesions resembling endosalpingiosis occurred in 16 (40%) of the 40 cases, but in 7 it was associated with serous tumor. Psammoma bodies frequently accompanied serous tumor and endosalpingiosis and in occasional cases the majority of lesions consisted of psammomatous foci. The duration of follow up is too short to adequately assess the biological significance of these findings, but it is clear that the peritoneal tumor occasionally may kill the patient within a few years. Serous tumor of low malignant potential is the most appropriate term to describe the general group of ovarian serous tumors of so-called borderline malignant type.