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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
decreased lung attenuation ... 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 ... - Respiratory bronchiolitis ... - Aspiration - Pulmonary ... HRCT #ChestCT #Differential ... #Upper #Lower #RadiologyAssistant
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
CT Patterns - Differential ... Hypersensitivity Pneumonitis, Respiratory ... : • Emphysema: ... #CT #Patterns #Differential ... #Diagnosis #pulmonary
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
Differential diagnosis of Lymphangitic Carcinomatosis. 
On the left multiple diseases showing septal thickening:
1. Lymphangitic carcinomatosis: irregular
Differential diagnosis ... with ground glass attenuation ... Carcinomatosis #Mimic #Differential ... #Comparison #Table ... #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
Respiratory bronchiolitis ... Diagnosis #Radiology #Pulmonary ... NodularPattern #Differential ... #Comparison #Table ... #RadiologyAssistant
It can be difficult to distinguish these three entities.
There are two diagnostic hints for further differentiation:
-
differentiation: - Look at expiratory ... bronchiolitis or chronic pulmonary ... right with the pulmonary ... MosaicAttenuation #Mosaic #Attenuation ... #Comparison #RadiologyAssistant