On the technique of cavernostomy, especially on our fundamental techniques.

Pneurnonectomy has recently made a rernarkable development on account of the discovery of penicillin and streptomycin. When compared with it open drainage treatment has much fallen behind in its development, although it belongs to the same category as pneumonectomy, both being direct rnethods of treatment. This may due to various reasons, but the most basic one rnay be that the technique of cavernostomy, inclusive of open treatrnent etc. after the eperation, has not generally been established, notwithstanding that it is the most typical of open drainage treatment. In our experience, however, open drainage treatment has its own indication and so the scope of surgical treatment for tuberculosis may be widened if this treatrnent is positively adopted. Therefore, it may be important to establish not only technique of it but also its after-treatment and to confirm its indication, even today when pneumonectomy and thoracoplasty are well developed and popularly practised. Since 1943, we have studied on open drainage treatment for tuberculosis, es-