THE RESPIRATORY SYSTEM. 



513 



the Lungs of Acute and of Chronic Type. Cheesy Pneumonia; Pneumonic 

 Phthisis. 



1. ACUTE TYPE. Sometimes large areas or whole lobes or the whole 

 lung may be the seat of an exudative process by which the affected region 



FIG. 295. ACUTE PULMONARY TUBERCULOSIS EXUDATIVE TYPE (ACUTE PHTHISIS CHEESY PNEUMO- 

 MIA): WITH EXTENSIVE DISINTEGRATION AND FORMATION OF CAVITIES. 



The pleura is much thickened. 



becomes solidified, the exudate consisting of epithelium with more or less 

 fibrin and pus. This exudate, together with the lung tissue, soon under- 

 goes necrosis, so that the solidified lung becomes dense, mottled, and 

 gray in color. Extensive disintegration (Fig. 295) of the consolidated 

 33 



