CARCINOMA of the breast in children is infrequently reported. In 1917, Levings1 published a case in a 12-year-old girl; in 1940, Sears and Schlesinger2 reported one in a 10-year-old girl. Other single case reports include that of Puente and Ramirez,3 Simmons,4 and the unique instance of a 6-year-old boy with a single axillary metastasis published by Hartman and Margish5 in 1955. To our knowledge a series of such cases giving comparative morphology and natural history as modified by various forms of therapy has not been reported. The present paper is based on the study of seven cases of breast carcinoma in young children that have come to our attention by way of consultation material sent to the Pathology Department at Memorial Hospital during the past 15 years. Because of the nature of this consultation practice, it is impossible to ascertain from how large a group