Amiodarone

Key points

• Amiodarone is a cause of lower zone pulmonary fibrosis, seen with long-term use
• causes of upper zone fibrosis include hypersensitivity pneumonitis (extrinsic allergic alveolitis)
• coal worker's pneumoconiosis / progressive massive fibrosis
• ankylosing spondylitis (rare)
• histiocytosis