Abstract：Objective To analyze the imaging features of influenza A H1N1.Methods Chest X-ray radiography and CT data were retrospectively analyzed in 36 patients with suspected H1N1 influenza.Results Among the 29 patients with influenza A positive,chest X-ray or CT scan was negative in 8,and the pneumonia occurred in 21 and pleural effusion in 11.Six patients with mild pneumonia showed blurred lung markings,central nodules or complicated subpleural interstitial inflammation.Six patients with moderate pneumonia showed subpleural multiple lobular patch-like shadow along lung markings or under the pleura accompanying with air bronchograms in pulmonary segmental consolidation.Eight patients with severe pneumonia displayed diffuse patches of shadow integration accompanying with consolidation in both lower lung zones.Among the 7 patients with influenza A negative,3 showed subpleural patche shadow of resemble influenza and 4 displayed segmental consolidation.Conclusion Influenza A H1N1 pneumonia has typical imaging characteristics,but features of subpleural plaques are not specific.Influenza A is not considered in patients with simple segmental consolidation.
2012, Vol. 52 
