The aim of this atlas is to illustrate the wide range of histological appearances which can be seen in brea. st biopsies and mastectomy specimens. An attempt has been made to include photomicrographs showing the more usual appearances as well as some of the unusual patterns encountered in most common lesions of the breast. In addition some of the rarer forms of mammary pathology have been illustrated, sometimes extensively, where this was considered important in the differential diagnosis and where photomicrographs of good quality were available. Some of the low power photomicro graphs lack...