Methotrexate-induced pneumonitis in a patient with Crohn's disease.

Pulmonary toxicity is a well recognised but infrequent adverse event of treatment with methotrexate. The vast majority of cases have occurred in patients with rheumatoid arthritis; here we present the case of a 44-year old woman with ileo-colonic Crohn's disease who developed methotrexate pneumonitis. The patient had a 10 year history of Crohn's disease and, in the last 18 months, she was treated with oral methotrexate because of steroid-dependency and intolerance to thiopurines.