452 THE CIRCULATORY SYSTEM. 



in the necrotic foci and in the detritus of the cysts calcification may 

 occur. 



Fatty degeneration, atrophy, and calcification may occur in the nius 

 cularis and adventitia of the involved vessels. 



Similar processes may occur in the aorta, the new tissue growth and 



FIG. 250.-CHROXIC ARTERITIS-ARTERIO-SCLEROSIS-CKREBnAL AUTERY. 



Inner coat thickened ; degeneration and softening (atheroma) of a part of the thickened area. 



the degeneration being less definitely limited to the inner layer of the 

 wall. The aorta may thus be beset with larger and smaller irregular, 

 white, hard, elevated thickenings (Fig. 251), often yellowish from fatty 

 degeneration. Beneath these there may be atheromatous softening, or 



FIG. 251.- CHRONIC INFLAMMATION' OF THE AORTA ATHEROMA OF THE AORTA. 

 Showing on the inner surface patches of new-formed tissue-ulceration and calcification. 



