342 DISEASES OF THE RESPIRATORY ORGANS. 



not now entirely fill the air-spaces ; it is composed mainly 

 of leukocytes, which have greatly increased in number and 

 are now undergoing a fatty degeneration (see Fig. 152). 



If the patient survives, the inflammatory process may 

 terminate in resolution, abscess formation or gangrene. 



FJG. 151. . 



Croupous pneumonia red hepatization. Three alveoli filled with fibrinous ex- 

 udate. In the latter a mesh-work of fibrin (/), desquamated alveolar epithelium 

 (e), leukocytes (I), and red blood-corpuscles, a, alveolar septa with capillaries. 

 X 250 (Schmaus). 



Resolution is the most frequent termination, and is brought 

 about by a fatty degeneration and liquefaction of the exudate, 

 which is finally absorbed by the lymphatics, or expectorated. 



Abscess-formation as the result of secondary infection with 

 pyogenic micro-organisms is a rare termination. It occurs 

 most frequently in the upper lobes. 



Gangrene also is a rare termination. It is especially liable 

 to occur in the drunkard, and in cases in which the circulation 

 is exceedingly weak. 



Associated lesions : Although the inflammatory process in 

 the lungs is the characteristic feature of lobar pneumonia, not 

 infrequently there are widespread pathological changes due to 

 the general systemic intoxication. Circulatory failure due to 



