mastectomy

例句：

1. 1. She underwent a mastectomy to remove the cancerous tumor.
   她接受了一个胸切除手术来移除那个癌瘤。
2. 2. The surgeon performed a mastectomy on her breasts for cosmetic reasons.
   外科医生出于美容原因对她的乳房进行了胸切除手术。
3. 3. Mastectomy is a common surgical procedure used to treat breast cancer.
   胸切除手术是一种常用的治疗乳腺癌的外科程序。