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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
The fourth pattern ... Bronchiectasis - Honeycombing ... low attenuation pattern ... Diagnosis #Radiology #Pulmonary ... Emphysema #SignetRing #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
there are four patterns ... histiocytosis or honeycombing ... seen and in many cases ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Low Attenuation pattern ... Honeycombing 4. ... #Clinical #Radiology ... LowAttenuation #Cystic #Pattern ... Comparison #Table #RadiologyAssistant
High Attenuation pattern (2) 
1. Non specific interstitial pneumonitis (NSIP): ground glass with traction bronchiectasis, no
High Attenuation pattern ... bronchiectasis, no honeycombing ... #Clinical #Radiology ... HighAttenuation #Pattern ... Comparison #Table #RadiologyAssistant
UIP
UIP is a histologic pattern of pulmonary fibrosis.
On a chest X-ray UIP manifests as a reticular
of pulmonary fibrosis ... demonstrating honeycombing ... #Clinical #Radiology ... #Honeycombing # ... RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Low Attenuation pattern ... Honeycombing. 4. ... #Clinical #Radiology ... LowAttenuation #Cystic #Pattern ... Comparison #Table #RadiologyAssistant
The CXR demonstrates a reticular interstitial pattern with a preference at the lung bases.
The HRCT demonstrates
preference at the lung bases ... #Clinical #Radiology ... #Interstitial #Pattern ... #Honeycombing # ... TractionBronchiectasis #RadiologyAssistant
Typical UIP with honeycombing and traction bronchiectasis in a patient with idiopathic pulmonary fibrosis (IPF) #Clinical
Typical UIP with honeycombing ... with idiopathic pulmonary ... fibrosis (IPF) #Clinical ... UIP #IPF #ILD #RadiologyAssistant
Here are the most common examples of these four patterns on a chest x-ray (click image
of these four patterns ... mass - Solitary Pulmonary ... Nodule - Multiple Masses ... Atelectasis #Diagnosis #Clinical ... #RadiologyAssistant
Honeycombing represents the second reticular pattern recognizable on HRCT.
Because of the cystic appearance, honeycombing is also
Honeycombing represents ... second reticular pattern ... low attenuation pattern ... #Clinical #Radiology ... UsualInterstitialPneumonia #RadiologyAssistant