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Upper lung zone preference is seen in: - Inhaled particles: pneumoconiosis (silica or coal) - Smoking related diseases (centrilobular emphysema - Respiratory bronchiolitis (RB-ILD) - Langerhans cell histiocytosis - Hypersensitivity pneumonitis - Sarcoidosis Lower zone preference is seen in: - UIP - Aspiration - Pulmonary edema #Diagnosis #Radiology #Pulmonary #HRCT #ChestCT #Differential #Table #Distribution #Upper #Lower #RadiologyAssistant