Objective To investigate the chest X ray manifestations of SARS cases Methods A retrospective study was conducted among 52 clinically confirmed SARS patients from February 9 to May 10, 2003 Chest X ray scanning was performed at a interval of 1-3 days according to the requirements The manifestations and special features of SARS in X ray were analyzed Results Small or large patchy shadows with intensive density in both lungs were observed in 31 cases, ground glass like opacification in 16, small patchy shadows in one lung lobe or one lung segment in 18, nodular shadows in one lung segment in 1, and increased lung marking in lung interstitial tissues in 2 Rapidly changing consolidations revealed in chest X ray images were found to be associated with SARS infections, and they were not affected by treatment with antibiotics Conclusion Chest X ray provides a sensitive and specific method for the diagnosis and treatment of SARS, and those present with symptoms and signs should undergo chest X ray scanning every 1-3 days Objective To investigate the chest X ray manifestations of SARS cases Methods A retrospective study was performed among 52 clinically confirmed SARS patients from February 9 to May 10, 2003 Chest X ray scanning was performed at a interval of 1-3 days according to the requirements The manifestations and special features of SARS in X ray analyzed results Small or large patchy shadows with intensive density in both lungs were observed in 31 cases, ground glass like opacification in 16, small patchy shadows in one lung lobe or one lung segment in 18, nodular shadows in one lung segment in 1, and increased lung marking in lung interstitial tissues in 2 Rapidly changing consolidations revealed in chest X ray images were found to be associated with SARS infections, and they were not affected by treatment with antibiotics Conclusion Chest X ray provides a sensitive and specific method for the diagnosis and treatment of SARS, and those present with symptoms and signs sh ouldcent chest X ray scanning every 1-3 days