Pulmonary manifestations of ulcerative colitis mimicking Wegener's granulomatosis.

We describe 2 patients with quiescent ulcerative colitis who developed clinical syndromes suggesting Wegener's granulomatosis. Both patients had features of systemic illnesses, nodular lung lesions, and antineutrophil cytoplasmic antibodies. Although the inflammatory bowel disease of both patients was quiescent at the time of their pulmonary presentations, lung biopsy results were consistent with pulmonary complications of ulcerative colitis, an unusual manifestation of that disorder. These cases illustrate that pathological confirmation of the diagnosis is essential in cases of suspected vasculitis. The patients' pulmonary lesions resolved promptly after treatment with corticosteroids.