目的　探讨CT扫描对小乳癌、隐匿性乳癌及腋窝淋巴结转移的诊断及对手术方式选择的指导价值。方法　采用俯卧位或仰卧位 ,扫描范围一般自乳房下界至腑窝顶 ,发现病变部位行薄层扫描 ,快速注入造影剂后测量相应层面的最高CT值。结果　CT扫描对小乳癌诊断准确性明显优于其它影像诊断方法 ,腋窝淋巴结转移的诊断假阳性及假阴性率较高。结论　CT扫描对小乳癌的诊断有一定价值。因腋窝淋巴结转移的诊断假阴性及假阳性率较高 ,对手术方式的选择仅供参考 ,不能作为依据 Objective To investigate the value of CT scan in the diagnosis of small breast cancer, occult breast cancer and axillary lymph node metastasis, and the guiding value of CT scanning. Methods In the prone or supine position, the scan range was generally from the lower breast to the axilla, and it was found that the lesion was scanned by thin layers. The highest CT value at the corresponding level was measured after the contrast agent was injected rapidly. Results The diagnostic accuracy of CT scans for small breast cancer was significantly better than that of other imaging methods. The diagnosis of axillary lymph node metastasis was false positive and false negative. Conclusion CT scan has a certain value in the diagnosis of small breast cancer. Because the diagnosis of axillary lymph node metastasis is false negative and false positive rate is high, the choice of surgical method is for reference only and cannot be used as a basis