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Diagnostic algorithm for idiopathic pulmonary fibrosis, in part adapted from the ATS/ERS consensus statement. HRCT =
computerised tomography; ILD ... pulmonary 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 Interstitial Pneumonias ... interstitial pneumonia (DIP ... #diagnosis #differential
Approach to the diagnosis of chronic hypersensitivity pneumonitis. 
*Consider additional test: bronchoscopy with bronchoalveolar lavage, transbronchial
hypersensitivity pneumonitis ... hypersensitivity pneumonitis ... computed tomography; UIP ...  = usual interstitial ... algorithm #HP #ILD
It is usually easy to recognize the pattern of UIP on HRCT. #Clinical #Radiology #CTChest #UIP
the pattern of UIP ... #Clinical #Radiology ... UsualInterstitialPneumonitis #Usual ... #Interstitial #Pneumonitis ... #ILD #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 ... lymphadenopathy #Clinical #Radiology ... #CTChest #UIP # ... UsualInterstitialPneumonitis #Usual ... #Interstitial #Pneumonitis
Notice the honeycombing and the preference of the subpleural and basal lung areas. #Clinical #Radiology #CTChest
#Clinical #Radiology ... #CTChest #UIP # ... UsualInterstitialPneumonitis #Usual ... #Interstitial #Pneumonitis ... #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 ... edema #Diagnosis #Radiology ... HRCT #ChestCT #Differential
Notice the honeycombing and the preference of the subpleural and basal lung areas. #Clinical #Radiology #CTChest
#Clinical #Radiology ... #CTChest #UIP # ... UsualInterstitialPneumonitis #Usual ... #Interstitial #Pneumonitis ... LowerLungPredominance #ILD
Connective tissue disease-associated interstitial lung diseases

LIP: lymphoid interstitial pneumonia. NSIP: nonspecific interstitial pneumonia. OP: organizing pneumonia.
lung diseases LIP ... I-JIP: usual interstitial ... AIP: acute interstitial ... ConnectiveTissueDiseases #ILD ... CTILD #Diagnosis #Differential
Causes of Interstitial Lung Disease - Differential Diagnosis Algorithm
Idiopathic Interstitial Pneumonia
 • (UIP) Usual Interstitial Pneumonia
Lung Disease - Differential ... Pneumonia • (UIP ... ) Usual Interstitial ... Chronic Radiation Pneumonitis ... Lung #Diseases #ILD