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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Lung cysts (LAM, LIP ... #Diagnosis #Radiology ... Differential #Diagram #Comparison ... #Honeycombing # ... Emphysema #SignetRing #RadiologyAssistant
UIP
UIP is a histologic pattern of pulmonary fibrosis.
On a chest X-ray UIP manifests as a reticular
to confirm the diagnosis ... demonstrating honeycombing ... HRCT demonstrated honeycombing ... #Clinical #Radiology ... #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
idiopathic interstitial pneumonias ... indicates unknown cause ... findings of NSIP, UIP ... #Diagnosis #Radiology ... ILD #Findings #RadiologyAssistant
The case on the left shows subpleural honeycomb cysts in several contiguous layers.
There is also a
The case on the ... Usual Interstitial Pneumonia ... #Clinical #Radiology ... Bronchiectasis #Honeycombing ... #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... histiocytosis or honeycombing ... UIP can be suspected ... #Diagnosis #Radiology ... #Differential #RadiologyAssistant
UIP with honeycombing (left) and chronic HP (right)
Differential diagnosis of Hypersensitivity Pneumonitis.
Subacute stage:
- RB-ILD: seen in
UIP with honeycombing ... ) Differential diagnosis ... #Radiology #CTChest ... #UIP #Comparison ... Fibrosis #Mimic #ILD #RadiologyAssistant
On the left two cases with chronic consolidation. 
There are patchy non-segmental consolidations in a subpleural
On the left two cases ... The final diagnosis ... fibrosis like honeycombing ... this #Clinical #Radiology ... OrganizingPneumonia #RadiologyAssistant
On the left a patient with GGO as dominant pattern.
In addition there is traction bronchiectasis indicating
This case is one ... As in UIP (usual ... fibrosis with honeycombing ... #Clinical #Radiology ... GroundGlass #GGO #RadiologyAssistant
In the images on your left you can appreciate again the spectrum of findings seen in
Notice the lack of honeycombing ... , excluding UIP ... as diagnosis. ... #Clinical #Radiology ... NonspecificInterstitialPneumonia #ILD #RadiologyAssistant
Acute interstitial pneumonia (AIP, earlier named Hamman Rich Pneumonitis) is a rare idiopathic lung disease characterized
Acute interstitial pneumonia ... outcome in many cases ... suggestive of the diagnosis ... #Clinical #Radiology ... AcuteInterstitialPneumonia #ILD #RadiologyAssistant