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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Bronchiectasis - Honeycombing ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... Diagram #Comparison #Honeycombing ... Emphysema #SignetRing #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
(LAM): uniform cysts ... bizarre shaped cysts ... Honeycombing 4. ... #Clinical #Radiology ... Comparison #Table #RadiologyAssistant
Typical UIP with honeycombing and traction bronchiectasis in a patient with idiopathic pulmonary fibrosis (IPF) #Clinical
Typical UIP with honeycombing ... with idiopathic pulmonary ... IPF) #Clinical #Radiology ... UIP #IPF #ILD #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
multiple thick walled cysts ... Honeycombing. 4. ... (LAM): regular cysts ... #Clinical #Radiology ... Comparison #Table #RadiologyAssistant
Honeycombing is defined by the presence of small cystic spaces with irregularly thickened walls composed of
Honeycombing is ... regardless of their cause ... #Diagnosis #Radiology ... #Pulmonary #Honeycombing ... #Differential #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
histiocytosis or honeycombing ... seen and in many cases ... #Diagnosis #Radiology ... #Pulmonary #CXR ... #Differential #RadiologyAssistant
UIP
UIP is a histologic pattern of pulmonary fibrosis.
On a chest X-ray UIP manifests as a reticular
histologic pattern of pulmonary ... In many cases you ... demonstrating honeycombing ... #Clinical #Radiology ... #RadiologyAssistant
On the left two cases of NSIP.
Note the varying combination of GGO and fibrosis (traction bronchiectasis),
On the left two cases ... but the lack of honeycombing ... #Clinical #Radiology ... NonspecificInterstitialPneumonia #ILD #RadiologyAssistant
Diffuse consolidation
The most common cause of diffuse consolidation is pulmonary edema due to heart failure.
This is
The most common cause ... consolidation is pulmonary ... from the various causes ... #Diagnosis #Radiology ... #Differential #RadiologyAssistant
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
Silicosis • Honeycombing ... Antitripsyn Def • Cysts ... : Idiopathic Pulmonary ... Differential #Diagnosis #pulmonary ... #radiology