Abstract
The capsule of nodular lesions resulting from the administration of anti-tuberculous agents r are commonly roentogenologically contracted successively and showed linear or scar-like shadow, in case that the caseous necrotic substance are removed.
However, in a small instances, cavitary shadows are reserved. It is considered that these phenomena are caused by the pathological variety of lesion. This report was made to investigate the pathological factors which give the influences on the attitude of capsule after the removal of necrotic substance of caseous lesion. The results were as follows.
1) The pathological changes of the capsule of caseous lesions were pararell to the internal changes of caseous variated portion and its inflammatory changes were intense when the softening processes of caseous tissue are reserved.
2) Drainage bronchi of the encapsulated lesions were commonly closed or showed high stenotic changes. But in the lesions showing the intensive inflammatory changes of capsule, these were patent.
3) Enlargement of the lesion due to its reactivation were commonly occured pen-capsular.
4) The indurative changes of surrounding lung tissue was rare in isolated encapsulated lesion, however, was common in the lesions having the numerous scattered lesions.
5) The transformation of capsule after removal of caseous tissue are controlled by change of capsule, existense of patency of drainage bronchi and the indurative change of the surrounding lung tissue.
6) The capsule is used to contracted and showed the scarlike shadow roentogenologically after the removal of caseous tissue does not exist and drainage bronchi are closed.
7) The capsule does not commonly contract and reserve cavitary shadow roentogenologically in case that fibrous changes of surrounding lung tissue are intense and drainage bronchi are patent.
