DISEASE OF THE VEINS AND ARTERIES. 297 



tained that the circulation of blood through the part is ob- 

 structed. 



ANEURISM. 



Aneurism is a tumor produced by the dilation of an artery. 

 When all the coats of the artery are dilated and form a pouch, it 

 is known as true aneurism. Rupture of the inner coat, while the 

 two outer coats remain uninjured, constitute a false aneurism. 

 "When tlie outer coats are ruptured, and the inner coat remains 

 uninjured, it is known as hernial aneurism. A dissecting aneu- 

 rism is where a separation of two of the coats of the artery takes 

 place. The blood flows between the separated coats and gradu- 

 ally dissects one coat from the other. 



Treatment. — If the aneurism can be got at, it should be cut 

 down upon, the artery ligatured, and the aneurism dissected out. 



