Necrobiotic Pulmonary Nodules in Ulcerative Colitis: Not Just a "Crohnic" Phenomenon.

Necrobiotic pulmonary nodules are an exceptionally rare extraintestinal manifestation of inflammatory bowel disease. Recognition is imperative because it may mimic other autoimmune pathologies such as granulomatosis with polyangiitis or sarcoidosis. We describe a 19-year-old man with a known history of ulcerative colitis who was found to possess bilateral pulmonary nodules on computed tomography imaging. Investigations that included an extensive autoimmune and infectious workup were inconclusive. Biopsy of the nodules revealed fibrinous exudate and palisading histiocytes that confirmed the diagnosis. He was started on prednisone therapy. A follow-up computed tomography a month later revealed near complete resolution.