Abstract: Objective: To investigate the CT findings of pulmonary laceration.Methods: The CT imagings of 51 cases with pulmonary laceration were analyzed retrospectively.Results: 249 lesions in total were found in the 51 patients.The CT findings included traumatic gas cyst(22 lesions),gas-fluid cyst(182 lesions) and fluid cyst(45 lesions).Various degree of pulmonary contusion around the lung laceration could be assessed.On dynamic follow-up observation of 20 patients,the gas cyst lesions could change to gas-fluid cyst or fluid cyst,and the gas-fluid cyst lesions could change to fluid cyst,but reversed variation was not found.Conclusion: The gas cyst,gas-fluid cyst and fluid cyst were the characteristic CT findings and dynamic morphology changes of pulmonary laceration.