This mnemonic has been used commonly to recall the differential diagnosis of upper lobe predominant pulmonary fibrosis (CASSET P):
C – cystic fibrosis
A – ankylosing spondylitis
S – silicosis
S – sarcoidosis
E – eosinophilic granuloma
T – tubercuolisis
P – pneumocystis carinii pneumonia
Read about idiopathic pulmonary fibrosis here, which is classically basal predominant with honeycombing.
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