Gut
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Extra-intestinal or metastatic Crohn's disease is being recognised increasingly, most commonly in the skin and genitourinary system. Only very rarely has it been reported in the lung. ⋯ Subsequent investigation showed the presence of intestinal Crohn's disease. The evidence for abnormal lung function in Crohn's disease and the possible pathogenesis of metastatic pulmonary Crohn's disease are discussed.