The pathological assessment of ovarian neoplasms. II: The proliferating 'epithelial' tumours.

All neoplasms of the ovary encountered in a 25-year study period at the King George V Memorial Hospital were classified according to the World Health Organisation Histological Classification of Ovarian Tumours. Of these, one thousand fell into the category designated as 'common epithelial tumours'. In this report a detailed histological assessment of the 144 proliferating epithelial tumours is presented, including the criteria for distinguishing them from their benign and malignant counterparts and for histological typing and grading of these tumours.