Pulmonary vasculitis complicating ulcerative colitis.

Pulmonary vasculitis is an infrequent complication of ulcerative colitis. The patient reported herein had biopsy-proven pulmonary vasculitis on two occasions, associated with flares in ulcerative colitis. The diagnosis of this entity is best made by open lung biopsy. Corticosteroid therapy appears to be a rational first step in the management of this condition.