Imaging Interstitial Lung Disease

CXR patterns of Interstitial Lung Disease - ddx 

Peripheral Reticular - netlike pattern 
(1) IPF
(2) connective tissue disease (RA, scleroderma, MCTD)
(3) pneumoconiosis (asbestosis)








Linear - kerly A, B lines 
(1) CHF
(2) lymphangitic carcinomatosis
(3) sarcoidosis
(4) pneumonia 






Nodular - numerous small opacities
(1) granulomatosis 
     (a) miliary TB, histo/coccidio/blastomycosis 
     (b) sarcoidosis
     (c) hypersensitivity pneumonitis
(2) pneumoconiosis (berylliosis, silicosis, talcosis)
(3) smoking related
     (a) langerhans cell histiocytosis 
     (b) respiratory bronchiolitis-associated interstitial lung disease,
          desquamative interstitial pneumonia
(4) malignant metastases




Cystic 
(1) end stage fibrosis due to sarcoidosis
(2) emphysema
(3) diffuse bronchiectasis (CF, ABPA, Kartagener's) 
(4) lymphangioleiomyomatosis (LAM)
(5) langerhans cell histiocytosis
(6) cystic PCP
(7) Birt-Hogg-Dubé syndrome