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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
- Emphysema - Lung ... cysts (LAM, LIP ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... Emphysema #SignetRing #RadiologyAssistant
Typical UIP with honeycombing and traction bronchiectasis in a patient with idiopathic pulmonary fibrosis (IPF) #Clinical
Typical UIP with ... honeycombing and ... fibrosis (IPF) #Clinical ... #Radiology #CTChest ... #RadiologyAssistant
The PA-film shows a silhouette sign of the left heart border.
Even without looking at the lateral
shows a silhouette sign ... anteriorly in the left lung ... #Clinical #Radiology ... #CXR #Pneumonia ... SilhouetteSign #RadiologyAssistant
Notice the honeycombing and the preference of the subpleural and basal lung areas. #Clinical #Radiology #CTChest
Notice the honeycombing ... subpleural and basal lung ... #Clinical #Radiology ... #CTChest #UIP # ... Pneumonitis #ILD #RadiologyAssistant
Notice the honeycombing and the preference of the subpleural and basal lung areas. #Clinical #Radiology #CTChest
Notice the honeycombing ... subpleural and basal lung ... #Clinical #Radiology ... #CTChest #UIP # ... LowerLungPredominance #ILD #RadiologyAssistant
High Attenuation pattern (2) 
1. Non specific interstitial pneumonitis (NSIP): ground glass with traction bronchiectasis, no
bronchiectasis, no honeycombing ... Cryptogenic organizing pneumonia ... #Clinical #Radiology ... #HRCT #CTChest ... Comparison #Table #RadiologyAssistant
The CXR demonstrates a reticular interstitial pattern with a preference at the lung bases.
The HRCT demonstrates
preference at the lung ... HRCT demonstrates honeycombing ... #Clinical #Radiology ... #CXR #UIP #CTChest ... TractionBronchiectasis #RadiologyAssistant
Honeycombing represents the second reticular pattern recognizable on HRCT.
Because of the cystic appearance, honeycombing is also
usual interstitial pneumonia ... (UIP). ... #Clinical #Radiology ... #CTChest #Honeycombing ... #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... findings of NSIP, UIP ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant
The case on the left shows subpleural honeycomb cysts in several contiguous layers.
There is also a
Usual Interstitial Pneumonia ... #Clinical #Radiology ... #CTChest #UIP # ... Bronchiectasis #Honeycombing ... #RadiologyAssistant