Low Attenuation pattern 1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of smoking; adenopathy and pleural effusion; sometimes pneumothorax. 2. LCH: multiple round and bizarre shaped cysts; smoking history. 3. Honeycombing 4. Centrilobular emphysema: low attenuation areas without walls. #Clinical #Radiology #HRCT #CTChest #LowAttenuation #Cystic #Pattern #Comparison #Table #RadiologyAssistant