HSBC

Mnemonics to remember the causes of air trapping on HRCT chest are:

• HSBC

Mnemonic

• H: hypersensitivity pneumonitis
• S: sarcoidosis
• B: bronchiolitis obliterans
• C: cystic fibrosis/bronchiectasis

A useful way to remember the mnemonic is recalling that once you are with HSBC, you are "trapped" with HSBC.