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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
result in decreased lung ... - Lung cysts (LAM ... LowAttenuation #Differential ... #Diagram #Comparison ... #SignetRing #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... (centrilobular emphysema ... bronchiolitis (RB-ILD ... HRCT #ChestCT #Differential ... #Upper #Lower #RadiologyAssistant
Pneumonia on Chest Xray and POCUS

Extensive pneumonia in lower left lobe (red arrow). 
POCUS: Dynamic air
in lower left lobe ... Pneumonia #Dynamic #AirBronchogram ... #POCUS #CXR #Comparison ... #Clinical #Lung
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Lobar pneumonia
On the chest x-ray there is an ill-defined area of increased density in the right
x-ray there is an ill-defined ... the right upper lobe ... weight loss or long ... Radiology #CXR #AirBronchogram ... Lobar #Pneumonia #RadiologyAssistant
UIP with honeycombing (left) and chronic HP (right)
Differential diagnosis of Hypersensitivity Pneumonitis.
Subacute stage:
- RB-ILD: seen in
chronic HP (right) Differential ... centrilobular emphysema ... throughout the whole lung ... #CTChest #UIP #Comparison ... #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Differential diagnosis ... Centrilobular emphysema ... Cystic #Cysts #Differential ... #Comparison #Table ... #RadiologyAssistant
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
In the differential ... To differentiate ... the surrounding lung ... #Cavity #Cyst #Emphysema ... #Comparison #RadiologyAssistant
Connective tissue disease-associated interstitial lung diseases

LIP: lymphoid interstitial pneumonia. NSIP: nonspecific interstitial pneumonia. OP: organizing pneumonia.
disease-associated interstitial lung ... ConnectiveTissueDiseases #ILD ... CTILD #Diagnosis #Differential ... #Comparison #Table
Notice that there are multiple densities in both lungs.
The larger ones are ill-defined and maybe there
densities in both lungs ... larger ones are ill-defined ... the right lower lobe ... dealing with the differential ... OrganizingPneumonia #BOOP #RadiologyAssistant
Stage I - Redistribution
In a normal chest film with the patient standing erect, the pulmonary vessels
supplying the lung ... In these cases comparison ... with old fims can ... Views of the upper lobe ... Redistribution #RadiologyAssistant