510 



THE RESPIRATORY SYSTEM. 



I 



FIG. 291. TrBERcrLous BRONCHO-PNEUMONIA. 



The walls of the bronchi are thickened and caseous and are surrounded by zones of exudative and 

 caseous pneumonia. This cut shows a small region, more highly magnified, of a lesion similar to that 

 shown in Plate V. 



and smaller consolidated areas may be dark red with firmer gray or yel- 

 lowish-gray central portions, in which the blood-vessels are obliterated, 

 or the whole area may be solid and in the fresh lung grayish-white. This 



FIG. ^.-TUBERCULOUS BRONCHO-PNEUMONIA. 



The wall of this medium-sized bronchus is caseous, tubercle tissue is formed about it and is extending into 

 the surrounding lung tissue. A cellular exudate is seen in the contiguous air vesicles. 



