乳腺髓样癌占所有乳腺癌的5%~7%,早期症状常不明显,患者就诊时肿块已较大,临床检查可扪及圆形肿块,质韧、表面平滑、移动性良好[1]。髓样癌是由低分化瘤细胞组成的边界清晰的一种乳腺癌,是一种特殊类型的浸润性乳腺癌,被认为有相对较好的预后。在大体标本病检上多以边界清晰改 Metastatic breast cancer accounts for 5% to 7% of all breast cancer, the early symptoms are often not obvious, the patient has a larger mass at the time of diagnosis, palpable clinical examination of round lumps, quality and toughness, smooth surface, good mobility [1] . Medullary carcinoma is a borderline clear type of breast cancer composed of poorly differentiated tumor cells. It is a special type of invasive breast cancer and is considered to have a relatively good prognosis. Mostly in the general examination of specimens to clear the border change