Causes of lung fibrosis

Upper lobe fibrosis "BREAST X"

B: bronchopulmonary aspergillosis
R: radiotherapy
E: extrinsic allergic alveolitis
A: ankylosing spondylitis
S: sarcoidosis
T: tuberculosis
X: histiocytosis X

Lower lobe fibrosis "CRABSS"

C: cryptogenic fibrosing alveolitis
R: rheumatoid arthritis
A: asbestosis
B: bleomycin
S: SLE
S: scleroderma