Surgical removal of all or part of a breast,sometimes including excision of the underlying pectoral muscles and regional lymph nodes,usually performed as a treatment for cancer.

• 乳房切除术，切除乳房或部分乳房的外科手术，包括位于下层的胸部肌肉和局部淋巴节，通常作为治疗乳腺癌而实施的手术。