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Interstitial Lung Diseases (ILD)
Exposure-Related ILD (a.k.a. extrinsic allergic alveolitis): 
 • Hypersensitivity pneumonitis, Farmer's lung, Bird
ILD caused by inhalation ... Pneumonias: • ... Idiopathic pulmonary fibrosis ... #diagnosis #differential ... #pulmonary #causes
Causes of Interstitial Lung Disease - Differential Diagnosis Algorithm
Idiopathic Interstitial Pneumonia
 • (UIP) Usual Interstitial Pneumonia
Causes of Interstitial ... Pneumonia - fibrosis ... Chronic Radiation Pneumonitis ... Lung #Diseases #ILD ... #Causes #Differential
ILD of Known Cause - Differential Diagnosis
Exposure:
 • Occupational: Asbestosis, Silicosis, Hypersensitivity, Pneumonitis
 • Treatment Related:
ILD of Known Cause ... - Differential ... Hypersensitivity, Pneumonitis ... #Causes #Differential ... #Diagnosis #interstitial
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
Thickening of the interstitium ... HRCT as seen in fibrosis ... disease (i.e. fibrosis ... Hypersensitivity pneumonitis ... #GroundGlass #Differential
HRCT findings in UIP
Honeycombing consisting of multilayered thick-walled cysts.
Architectural distortion with traction bronchiectasis due to fibrosis.
Predominance
bronchiectasis due to fibrosis ... Mild mediastinal ... lymphadenopathy #Clinical #Radiology ... UsualInterstitialPneumonitis #Usual #Interstitial ... #Pneumonitis #ILD
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
bronchiolitis (RB-ILD ... Hypersensitivity pneumonitis ... edema #Diagnosis #Radiology ... Pulmonary #HRCT #ChestCT ... #Differential #
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
High-Res Chest CT ... Patterns - Differential ... Lymphangitic Carcinoma, Interstitial ... Hypersensitivity Pneumonitis ... HiRes #HighRes #Chest
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
pneumonias (IIPs ... indicates unknown cause ... combinations of fibrosis ... #Diagnosis #Radiology ... IdiopathicInterstitialPneumonia #ILD
Here are the most common examples of these four patterns on a chest x-ray (click image
patterns on a chest ... consolidation - Multifocal ill-defined ... - Reticular interstitial ... Nodule - Multiple Masses ... Diagnosis #Clinical #Radiology
Progressive Massive Fibrosis on Chest X-Ray
In a construction worker presenting with shortness of breath.
Progressive Massive Fibrosis
on Chest X-Ray ... is a chronic interstitial ... pneumoconiosis which is caused ... #Chest #XRay #CXR ... silicosis #clinical #radiology