UIP with honeycombing (left) and chronic HP (right) Differential diagnosis of Hypersensitivity Pneumonitis. Subacute stage: - RB-ILD: seen in smokers, upper lobe predilection, usually associated with centrilobular emphysema. - Alveolar proteinosis. Chronic stage: - UIP: may show very similar HRCT findings. - UIP has a strong lower zone distribution. In chronic HP fibrotic changes are typically seen throughout the whole lung parenchyma from the periphery towards the centrum. #Clinical #Diagnosis #Radiology #CTChest #UIP #Comparison #Chronic #HypersensitivityPneumonitis #Fibrosis #Mimic #ILD #RadiologyAssistant
