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Diagnostic algorithm for idiopathic pulmonary fibrosis, in part adapted from the ATS/ERS consensus statement. HRCT =
fibrosis, in part ... computerised tomography; ILD ... fibrosis; UIP = ... usual interstitial pneumonitis ... #IPF #UIP #Algorithm
Interstitial Lung Diseases (ILD)
Exposure-Related ILD (a.k.a. extrinsic allergic alveolitis): 
 • Hypersensitivity pneumonitis, Farmer's lung, Bird
Hypersensitivity pneumonitis ... • Radiation pneumonitis ... • Idiopathic pulmonary ... fibrosis (IPF), ... #differential #pulmonary
Typical UIP with honeycombing and traction bronchiectasis in a patient with idiopathic pulmonary fibrosis (IPF) #Clinical
Typical UIP with ... with idiopathic pulmonary ... fibrosis (IPF) ... #Clinical #Radiology ... IPF #ILD #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
bronchiolitis (RB-ILD ... Hypersensitivity pneumonitis ... is seen in: - UIP ... - Aspiration - Pulmonary ... #Upper #Lower #RadiologyAssistant
HRCT findings in UIP
Honeycombing consisting of multilayered thick-walled cysts.
Architectural distortion with traction bronchiectasis due to fibrosis.
Predominance
HRCT findings in UIP ... bronchiectasis due to fibrosis ... lymphadenopathy #Clinical ... #Interstitial #Pneumonitis ... #ILD #RadiologyAssistant
More common & convincing pneumonia mimics 

Aspiration pneumonitis, 
Pulmonary vasculitis, 
Acute eosinophilic pneummia,  
Cryptogeric organizing
Aspiration pneumonitis ... , Pulmonary vasculitis ... Drug -induced pneumonitis ... Pneumocystis jiroveci (PIP ... fibrosis (IPF),
Schematic classification of interstitial lung diseases according to aetiology. The finding of histological usual interstitial pneumonitis
usual interstitial pneumonitis ... of idiopathic pulmonary ... fibrosis. ... 2/146.long #ILD ... #LungDisease #Pulmonary
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
HRCT as seen in fibrosis ... predominance: UIP ... Hypersensitivity pneumonitis ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Chronic hypersensitivity pneumonitis
The key findings in chronic hypersensitivity pneumonitis are:
Mosaic pattern with areas of ground-glass atenuation
Fibrosis and parenchymal ... existing irreversible fibrosis ... #Clinical #Radiology ... HypersensitivityPneumonitis #Chronic #Fibrosis ... #RadiologyAssistant
UIP with honeycombing (left) and chronic HP (right)
Differential diagnosis of Hypersensitivity Pneumonitis.
Subacute stage:
- RB-ILD: seen in
Hypersensitivity Pneumonitis ... Subacute stage: - RB-ILD ... In chronic HP fibrotic ... #Clinical #Diagnosis ... #Mimic #ILD #RadiologyAssistant