Invasive Micropapillary Carcinoma: A Rare Case of Male Breast Cancer

Invasive micropapillary carcinoma (IMPC) is a rare form of breast cancer, accounting for 3.8-5.9% of all breast cancer types. Less than 1% of all breast cancer occurs in men and there have been only nine other cases of IMPC specifically in male patients reported in the literature. This case presents a 77-year-old Caucasian man who was found to have IMPC of the left breast after presenting for a painless mass in the left lower subareolar region. After a left modified radical mastectomy, the patient was found to have only one metastatic lymph node with his variant of IMPC being less aggressive requiring no further treatment other than annual surveillance with mammography.