ABSTRACT
Introduction Interstitial lung disease (ILD) encompasses a spectrum of conditions, with confusing nomenclature and varying prevalence. The commonest ILDs are the idiopathic interstitial pneumonias (IIP), sarcoidosis, and extrinsic allergic alveolitis (EAA). Clinical evaluation may be complicated by the variable presence of airway disease, pulmonary hypertension, opportunistic infection, and cardiac involvement.
