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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
attenuation or air-filled ... Honeycombing Most diseases ... on the basis of HRCT ... #Diagnosis #Radiology ... #Diagram #Comparison
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... Smoking related diseases ... edema #Diagnosis #Radiology ... #Pulmonary #HRCT ... #ChestCT #Differential
More than 100 entities manifest as diffuse lung disease.
Fortunately only about 10 of these account for
disease. ... diseases, that ... also uncommon HRCT-presentations ... #Diagnosis #Radiology ... SHITFACED #Mnemonic #HRCT
CT Lung Signs in Pulmonary Diseases - One Page Summary of Pulmonary Signs
 - Air Crescent
CT Lung Signs in ... Pulmonary Diseases ... Pulmonary Signs - Air ... #diagnosis #differential ... #radiology
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... in interstitial lung ... disease comes from ... disease and what ... #Diagnosis #Radiology
Connective tissue disease-associated interstitial lung diseases

LIP: lymphoid interstitial pneumonia. NSIP: nonspecific interstitial pneumonia. OP: organizing pneumonia.
interstitial lung ... diseases LIP ... AIP: acute interstitial ... CTILD #Diagnosis #Differential ... #Comparison #Table
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
resolution of the HRCT ... the result of air ... or interstitial lung ... bronchiolitis #Diagnosis #Radiology ... #GroundGlass #Differential
Interstitial Lung Diseases (ILD)
Exposure-Related ILD (a.k.a. extrinsic allergic alveolitis): 
 • Hypersensitivity pneumonitis, Farmer's lung, Bird
Diseases (ILD) ... disease (RB-ILD ... interstitial pneumonia (AIP ... #Diseases #ILD ... #diagnosis #differential
Consolidation is synonymous with airspace disease.
When you think of the causes of consolidation, think of 'what
with airspace disease ... replacing the air ... UIP, NSIP and long ... #Diagnosis #Radiology ... Consolidation #Differential
Radiographic Features of Pulmonary Diseases
 - Pneumonia
 - Atelectasis
 - Emphysema
 - Pneumothorax
 - Effusion
 -
Features of Pulmonary Diseases ... #Pulmonary #Diseases ... #Radiology #Patterns ... #Lung #CXR #XRay ... #ChestCT #Differential