TUMORS AFFECTING CATTLE. 331 



extends back into the body of the lower jaw for a considerable 

 distance. 



Tumors of this kind, being of congenital origin, are very naturally 

 observed most frequently in young cattle, but they may continue to 

 expand for a period of several months after the birth of the calf, even 

 until they become troublesome and unsightly. 



Treatment for dental cysts. — Treatment consists in the complete 

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

 curetting. 



EETENTION CYSTS. 



Retention cyst<5 arise from the retention of normal secretions, due 

 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 tumors, 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 varj^ing from peas to pigeon eggs, are 

 roundish and translucent, and surrounded by a delicate vascular 

 membrane. They contain a siruplike substance more or less thick 

 and transparent and whitish yellow in color. 



Treatment fo-r mucous cysts. — Treatment consists in the punctur- 

 ing 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). 



Treatment for 'proliferation, cysts. — The treatment indicated in this 

 case is the removal of the diseased ovaries. 



