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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
The fourth pattern ... result in decreased lung ... attenuation or ... - Emphysema - Lung ... pattern can be
Chronic hypersensitivity pneumonitis
The key findings in chronic hypersensitivity pneumonitis are:
Mosaic pattern with areas of ground-glass atenuation
pneumonitis are: Mosaic pattern ... of ground-glass atenuation ... and areas of low attenuation ... shows a mosaic pattern ... nodules of increased attenuation
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
in interstitial lung ... there are four patterns ... , high and low attenuation ... is interstitial lung ... The cystic pattern
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Low Attenuation ... pattern 1. ... emphysema: low attenuation ... LowAttenuation #Cystic #Pattern
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Low Attenuation ... pattern (2) 1. ... emphysema: low attenuation ... LowAttenuation #Cystic #Pattern
COVID-19 Patterns of Lung Findings on Chest CT
1. Reverse Halo Sign
2. ARDS
3. Crazy-Paving Pattern
4. Bilateral Peripheral
COVID-19 Patterns ... of Lung Findings ... Crazy-Paving Pattern ... pediatrikradyoloji #COVID19 #Patterns ... #Lung #Pulmonary
When auscultating, you want to start in the same place every time, typically the patient’s right
creates the “S” pattern ... #auscultation #lung ... #respiratory #patterns
High Attenuation pattern (2) 
1. Non specific interstitial pneumonitis (NSIP): ground glass with traction bronchiectasis, no
High Attenuation ... pattern (2) 1. ... HighAttenuation #Pattern
High Attenuation pattern 
1. Chronic eosinophilic pneumonia with peripheral areas of ground glass opacity.
2. Sarcoid end-stage
High Attenuation ... pattern 1. ... HighAttenuation #Pattern
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
High-Res Chest CT Patterns ... Honeycombing - See Low Attenuation ... Bronchopneumonia High Attenuation ... Water, Tumor Low Attenuation ... HighRes #Chest #CT #Patterns