TUMORS AFFECTING CATTLE. 317 



Treatment for dental cysts. — Treatment consists in the complete 

 extirpation of the cyst and the destruction of the lining pouch by 

 curetting. 



RETENTION CYSTS. 



Retention cysts arise from the retention of normal secretions, 

 owing to obstruction of a duct leading from a gland. The mucous 

 cysts found in the mouth, udder, and vestibule of cows are samples 

 of this form. 



Mucous CYSTS. — Saclike dependent tvunors, caused by retention of 

 the secretions from the mucous glands, sometimes develop in the 

 mouth, nose, pharynx, and vulva of cattle. They are called " mucous 

 cysts." These are of sizes varying from peas to pigeon eggs, are 

 roundish and translucent, and surrounded by a delicate, vascular mem- 

 brane. They contain a siruplike substance more or less thick and 

 transparent and whitish yellow in color. 



Treatment consists in the puncturing of the swelling, if accessible, 

 and the destruction of the cyst walls by the injection of Lugol's 

 solution. 



PROLIFERATION CYSTS. 



These are found especially in the ovaries of cows, called " cystic 

 ovaries," and may produce nymphomania (chronic bulling). 



The treatment indicated in this case is the removal of the diseased 

 ovaries. 



