双侧乳腺癌包括双侧原发性乳腺癌和双侧转移性乳腺癌[1] 。双侧乳腺癌一般指双侧原发性乳腺癌 ,一侧乳腺癌术后对侧乳房转移癌较少见。乳腺癌术后 ,对侧乳房发生的乳腺癌在临床上判断其原发或继发 (转移 )是困难的 ,至今没有统一的标准。本文报道 9例临床病理诊断的继发于第一 Bilateral breast cancer includes bilateral primary breast cancer and bilateral metastatic breast cancer [1]. Bilateral breast cancer generally refers to bilateral primary breast cancer. Contralateral breast metastases are rare after one-sided breast cancer surgery. After breast cancer surgery, breast cancer in the contralateral breast is judged clinically as primary or secondary (metastasis). There is no uniform standard so far. This article reports 9 cases of clinical pathological diagnosis secondary to the first