Abstract: Objective To discuss the rare CT findings of lung metastases. Methods By retrospective analysis of 17 cases of lung metastases,the rare CT findings of cavity metastases,calcified pulmonary metastases and calcified pleural metastases were investigated,and the causal relationship between the metastases and the original tumor was also approached. Results Among the rare CT performance of 17 lung metastases,the sign of cavity metastases was found in 13 cases,calcified pulmonary metastases in 4 cases and calcified pleural metastases in 1 case. Conclusion Lung metastases can show a variety of non-typical CT signs,and it is of great clinical significance to recognize these rare CT features.