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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
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#Diagnosis #Radiology ... #Pulmonary #CTChest ... #LowAttenuation ... Differential #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
low attenuation areas ... Radiology #HRCT #CTChest ... #LowAttenuation ... Cystic #Pattern #Comparison ... #Table #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
low attenuation areas ... Radiology #HRCT #CTChest ... #LowAttenuation ... Cystic #Pattern #Comparison ... #Table #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
The idiopathic interstitial ... listed in the table ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... lung disease comes ... low attenuation (table ... lung disease and ... #Differential #RadiologyAssistant
Septal thickening
Thickening of the lung interstitium by fluid, fibrous tissue, or infiltration by cells results in
Thickening of the lung ... lung disease, it ... (Table). ... Pulmonary #HRCT #CTChest ... #Differential #RadiologyAssistant
Lung abnormalities mostly present as areas of increased density, which can be divided into the following
Lung abnormalities ... solitary or multiple Interstitial ... published soon: Chest ... #Diagnosis #Pathophys ... #Patterns #RadiologyAssistant
Differential diagnosis of Lymphangitic Carcinomatosis. 
On the left multiple diseases showing septal thickening:
1. Lymphangitic carcinomatosis: irregular
Differential diagnosis ... bronchovascular interstitium ... Radiology #Pulmonary #CTChest ... #Differential #Comparison ... #Table #RadiologyAssistant
Acute interstitial pneumonia (AIP, earlier named Hamman Rich Pneumonitis) is a rare idiopathic lung disease characterized
Acute interstitial ... rare idiopathic lung ... suggestive of the diagnosis ... Clinical #Radiology #CTChest ... AcuteInterstitialPneumonia #ILD #RadiologyAssistant