Abstract
The present study was carried out on about 810 cases of pulmonary tuberculosis from ten national sanatoria in Tohoku districts. The cases had been treated with pneumothorax for a period over six months and observed more than three years after abandonment of the treatment. Among them 766 cases (890 sides) were followed up and analyzed. The mean duration of the follow-up after abandonment of pneumothorax was about 7.5 years, and the results were as follows: at work 43.3, under treatment 14.9 and dead 41.8 per cent. In the 291 cases whose response to pneumothorax had been entirely satisfactory, the cumulative mortality due to tuberculosis alone was 10.5 per cent after five years.
