A 74 year-old woman with accessory breast cancer in the left axillar region had a painful mass in the left axillar region. Physical examination revealed a mass of about 3 cm in diameter with hemorrhagic ulceration of the skin. The movements of her left arm were severely limited because of the pain. A biopsy specimen showed malignant metastatic tissues, whereas the gallium scintigram and bone scintigram disclosed multiple systemic metastases. Though radical cure could not be achieved surgically, she underwent local resection of the left axillar mass to alleviate the clinical symptoms. The histopathological examinaton revealed a solid tubular adenocarcinoma combined with scirrhous type adnocarcinoma, which was compatible with that of breast cancer. Her clinical symptoms were remarkably improved after operation and then she was followed up at the outpatient clinic. However, she died of respiratory failure due to pleural metastases 10 months after operation.