Abstract
BACKGROUND: Lymphocytic mastitis is a disease of premenopausal women, and its association with type 1 diabetes mellitus is the basis for its alternative name 'diabetic mastopathy'. It is a benign condition but must be considered in the differential diagnosis of breast cancer, especially in diabetic patients. CASE REPORT: We present the case of an overweight 50-year-old dyslipidemic woman with metabolic syndrome presenting with lymphocytic mastitis. CONCLUSION: Although lymphocytic mastitis is usually regarded as an autoimmune disease seen mostly in diabetic patients, it may also be seen in nondiabetic patients with metabolic syndrome who do not have an autoimmune disease.