Low Attenuation pattern (2) 1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery in the center. 2. Langerhans cell histiocytosis (LCH): multiple thick walled cysts; smoking history. 3. Honeycombing. 4. Lymphangiomyomatosis (LAM): regular cysts in woman of child-bearing age. #Clinical #Radiology #HRCT #CTChest #LowAttenuation #Cystic #Pattern #Comparison #Table #RadiologyAssistant