RT Journal Article SR Electronic T1 Nongranulomatous interstitial lung disease in Crohn's disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 380 OP 382 DO 10.1183/09031936.96.09020380 VO 9 IS 2 A1 G Hotermans A1 A Benard A1 H Guenanen A1 G Demarcq-Delerue A1 T Malart A1 B Wallaert YR 1996 UL http://erj.ersjournals.com/content/9/2/380.abstract AB Crohn's disease is a granulomatous systemic disorder of unknown aetiology. Obvious pulmonary involvement is exceptional. We report the case of a 33 year old woman treated with mesalazine for Crohn's disease and presenting with dyspnoea. Pulmonary function tests showed a restrictive ventilatory pattern with hypoxaemia on exertion. Chest radiography disclosed an interstitial pattern with ground glass on high resolution computer tomography. Clinical and radiological abnormalities progressed after withdrawal of mesalazine. Corticosteroids led to a partial regression but were stopped because of severe side-effects. Because of worsening of the clinical situation, open lung biopsy was performed and showed a histopathological aspect of nongranulomatous interstitial diffuse lung disease with an inflammatory lymphoid infiltration associated to some mild interstitial collagen fibrosis. Addition of cyclophosphamide to high-dose pulse steroid therapy induced a significant and sustained improvement.