Chronic hypersensitivity pneumonitis The key findings in chronic hypersensitivity pneumonitis are: Mosaic pattern with areas of ground-glass atenuation and areas of low attenuation. Fibrosis and parenchymal distortion in a mid zone distribution. On the left a patient with chronic hypersensitivity pneumonitis. The HRCT shows a mosaic pattern with hyperaerated secondary nodules and secondry nodules of increased attenuation. Additionally there is septal and intralobular reticular thickening, indicating already existing irreversible fibrosis. #Clinical #Radiology #CXR #CTChest #Hypersensitivity #Pneumonitis #HypersensitivityPneumonitis #Chronic #Fibrosis #RadiologyAssistant
