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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
These include: - Emphysema ... Diagnosis #Radiology #Pulmonary ... LowAttenuation #Differential ... #Diagram #Comparison ... #SignetRing #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
(centrilobular emphysema ... - Aspiration - Pulmonary ... Diagnosis #Radiology #Pulmonary ... HRCT #ChestCT #Differential ... #Upper #Lower #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 ... without associated pulmonary ... emphysema. ... #Comparison #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
Diagnosis #Radiology #Pulmonary ... NodularPattern #Differential ... #Comparison #Table ... #RadiologyAssistant
Differential diagnosis of Lymphangitic Carcinomatosis. 
On the left multiple diseases showing septal thickening:
1. Lymphangitic carcinomatosis: irregular
Differential diagnosis ... Cardiogenic pulmonary ... Carcinomatosis #Mimic #Differential ... #Comparison #Table ... #RadiologyAssistant
Honeycombing is defined by the presence of small cystic spaces with irregularly thickened walls composed of
from paraseptal emphysema ... Diagnosis #Radiology #Pulmonary ... #Honeycombing #Differential ... #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 ... #CTChest #UIP #Comparison ... Fibrosis #Mimic #ILD #RadiologyAssistant
On the left a smoker with RB-ILD with subtle HRCT-findings.
The dominant pattern is ground glass opacification.
Additional
are paraseptal emphysema ... there is a broad differential ... probably would be pulmonary ... would expect more pulmonary ... RespiratoryBronchiolitis #ILD #RadiologyAssistant