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©2013 UpToDate ® Print Email CT patterns of bronchiolitis Pattern of bronchiolitis Characteristic radiologic features Prototype disease/association Cellular Centrilobular nodularity Tree-in-bud pattern Acute infection (viral, mycoplasma) Constrictive Diffuse or geographic air trapping/mosaic pattern Cryptogenic bronchiolitis obliterans Follicular Centrilobular nodules Peribronchial nodules Ground glass opacity Rheumatoid lung disease Airway centered interstitial fibrosis Peribronchovascular ground glass opacities Traction bronchiectasis Thickening of bronchial walls Airway centered interstitial fibrosis Panbronchiolitis Tree-in-bud pattern Bronchiolectasis Bronchiectasis Diffuse panbronchiolitis Respiratory bronchiolitis Poorly defined centrilobular nodules Patchy ground glass attenuation Smoker's lung Adapted from: Pipavath, SJ, Lynch, DA, Cool, C, et al. Radiologic and pathologic features of bronchiolitis. AJR Am J Roentgenol 2005; 185:354.