The histological characterization of mammary cancer (MC) is of leading importance for prognosis and choice of therapeutic methods (directed hormonal and chemotherapy). In this respect of interest is the morphological picture of a special form of MC, lobular cancer which is characterized by the most malignant course, marked infiltrative and less manifest destructive growth, multicentricity and multiplicity, as well as bilateral foci of lesions. It probably originates from the myoepithelium. In the national literature, no information on lobular MC is available. Little information is available on the precursor of lobular MC, lobular carcinoma in situ. This problem is insufficiently and inaccurately dealth with in the International classification of mammary gland tumors (WHO). A review of literature on lobular MC, as well as photomicrographs of its structure and that of its precursor are presented.