2l8 



Retrogressive Processes. 



as a rather rare occurrence, transforming the intima of the vessel, 

 as the aorta, into a rough, scaly surface, or appearing as flat plaque- 

 like or disc-like areas, making the vessel at such places rigid and 

 inelastic. The greatest tendency to this change is found in the 

 large verminous aneurisms in horses, which form brittle, hard 

 enlargements of the arteries. The intima and the media in these 

 lesions are the especial seat of the calcification, preceded by hyaline 

 degeneration. 



Fig. 33. 



Portion of liver of a liorse with calcification of necrotic parasitic foci 



Trolldenier.) 



(After 



In greater measure newly-formed inflammatory connective tissue 

 is rather often affected; thus the cicatrized castration wound of 

 the abdominal wall in hogs may be observed changed into a calcified 

 plate as broad as a hand, and the opening into a hernial sac in um- 

 bilical hernias in the same animals is sometimes changed into a cal- 

 cified ring of connective tissue. Calcareous plates in the connective 

 tissue of the cow's udder are sometimes found ; and even the con- 

 nective tissue of the lungs is in rare instances (in cattle) trans- 



