“…In some of the reported cases attempts at dilatation of the resulting stricture of the bronchus have been made in order to bring about aeration of the collapsed lung, but have met with partial success in two cases only, reported by Piaget in 1939 andLoffler andNager in 1941. In the absence of infection in the collapsed lung, to relieve dyspnoea and to correct chest discomfort and displacement of the mediastinum, artificial pneumothorax has been performed by Clerf (1940), and also by Tyson and Lyle (1942). This treatment brought about relief of symptoms.…”