Abstract
A method of classification of mammographic parenchymal patterns is proposed and the minor differences between this classification and that described by Wolfe are enumerated. The importance of recognizing the parenchymal pattern in various circumstances is illustrated. The usefulness of regarding the parenchymal pattern as a backgrond when teaching mammographic interpretation is examined. The relationships in the population of Nottingham, UK between parenchymal patterns and benign disease, cancer as well as some determinants of risk for the future development of breast cancer are discussed. The association discovered between the estrogen receptor status of tumors and the parenchymal pattern in which they arise is given, and the possibility of using this relationship in order to give some indication both towards the choice of treatment and also of prognosis, is briefly discussed.