Roentgen examination affords a reliable and comparatively easy method of studying the structure, physiology and pathology of the female breast. Neoplasms and other pathologic processes in the mammary glands can be visualized on the roentgenogram; also the changes incidental to menstruation, pregnancy and the menopause. By clinical examination it is often impossible to determine whether or not a mass is present in the breast. Transillumination has thus far not proved dependable as a means of diagnosis. Formerly it was necessary to resort to biopsy or operative removal in cases of suspected or questionable new growth of the mammary gland in order to make a definite diagnosis. The necessity of repeated palpation and diagnostic operation is greatly lessened by roentgen studies.
We have made roentgen examinations of the breast in 320 cases during the past three years and are of the opinion that it is possible to determine the presence of