PNEUMONIA 27 



become filled to a greater or less extent with casts 

 consisting of coagulated fibrin and cells. 



Fortunately, abscess formation is the exception 

 rather than the rule in lobular pneumonia, the dis- 

 ease seldom going beyond the third stage. 



Gangrene seldom occurs in idiopathic pneumonia, 

 it being met with chiefly in those cases in which 

 the pneumonia is secondary to or complicated with 

 some other a"ff ection. It is characterized by the 

 breaking down of the lung tissue into a fetid, 

 dirty, greenish-yellow pulp, and by more or less 

 greenish discoloration of the surrounding consoli- 

 dated tissue. The gangrenous condition may involve 

 either an extensive tract of lung tissue of several 

 scattered areas or even a single small patch. The 

 complications of pneumonia are pleurisy, bronchitis, 

 icterus, and intestinal congestion. It is common to 

 find on autopsy the right side of the heart filled 

 with a fibrinous coagulum which is prolonged into 

 the pulmonary artery (antemortem clot), while the 

 left side is contracted and almost empty. 



Symptoms. — The lobular type, the common pneu- 

 monia of the dog, attacks its victims insidiously 

 during the progress of some other disease, such as 

 distemper or bronchitis. Its onset is not usually 

 marked by rigors or the violent circulatory dis- 

 turbances noted in the lobar form. In patients 

 sufifering, from bronchitis or distemper the super- 

 vention of this form of pneumonia may be sus- 

 pected by an aggravation of the respiratory dis- 

 turbance. The temperature mounts higher, the 

 respirations are more labored, and the puffing out 

 of the cheeks at each expiration more marked. 

 Auscultatory and percussive phenomena are not so 

 distinctive as in the idiopathic form, but apart from 

 its insidious approach, longer course, and greater 



