Histologic variants of lipid-secreting carcinoma of the breast.

Ten new cases of so-called lipid-secreting carcinomas of the breast are presented. Histopathologic analysis suggests three different microscopical patterns which are all characterized by abundant intracytoplasmic neutral fat deposits. Review of the literature yielded only 15 well-documented cases. Diagnostic problems are emphasized, with special regard to the secretory differentiation of normal and neoplastic mammary cells.