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1. INTRODUCTION 1.1 An overview of the ILD guideline Since the publication of the first BTS guidelines for diffuse lung disease nearly 10years ago, 1 the specialty has seen considerable change. The early discussions of the Guideline Group centred upon whether the revised document might consist of the 1999 document with minor adaptations. However, it was considered that too much change had taken place in the intervening years to justify a simple editorial approach. The last decade had seen the development of a new consensus terminology for the idiopathic interstitial pneumonias (IIP) 2 stimulated, in part, by the identification of non-specific interstitial pneumonia (NSIP) as a discrete histological pattern with increasingly recognised clinical correlates. 3 The better prognosis seen in fibrotic NSIP than in idiopathic pulmonary fibrosis (IPF) 4 5 fuelled a more intense approach to diagnosis in cases of suspected …