[A case of breast cancer with lipid secretion].

Lipid-secreting carcinoma of the mammary gland is a very rare disease entity. We have experienced a 59-year-old woman diagnosed as having cancer of the left breast and treated by mastectomy. The excised material was found to be afflicted with common duct carcinoma partially involved in lipid secretion. This patient had a relapse and died three and a half years after the mastectomy. The autopsy material consisted mostly of lipid-secreting carcinoma. The pathogenesis of this disease and changes of histological figures are also discussed.