“…The clinical syndrome of superior vena caval obstruction was for many years regarded as the hallmark of mediastinal fibrosis, and earlier reports of this condition are in reviews of the causes of superior vena caval obstruction (Osler, 1903;Knox, 1925;Keefer, 1938). While this is still a major clinical feature, the description of cases of involvement of 86 other mediastinal structures-for example, pulmonary artery (Nelson et al, 1965), pulmonary vein (Bindelglass and Trubowitz, 1958), lung (Benfield et al, 1962), bronchus and oesophagus (Hache et al, 1962), and coronary artery (Reed and Stinely, 1959) -have highlighted the variability of clinical presentation.…”