TUMORS AFFECTING CATTLE. 



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ter. One tooth may be included alone in the cyst or a number may be 

 inclosed together. However this may be, the malformation progresses, 

 especially if confined to the incisor teeth, until the remaining teeth, that 

 began to develop normally, are crowded out of position and rendered 

 useless. The tumor may reach the size of a man's fist. It appears 

 to be fleshy and dents upon pressure, but it may also appear on closer 

 examination as though it contained irregular sections of thin bone. 

 The outer surface is always smooth, and no indication of purulence, 

 softening, or scab formation is ever exhibited. Upon being laid open 

 with the knife' the tumor is seen to, be surrounded by a firm, smooth 

 membrane which limits it completely from the adjoining tissues. It is 

 filled with material which possesses partly edematous, partly fleshy, 

 and partly bony properties. It is supposed that this mass is composed 

 of rudiments of the jawbone or of the alveolar walls which, becoming 

 spongy, lose themselves in the soft, fleshy mass contained within the 

 capsule of the tumor. It occasionally happens that the tumor is hol- 

 low and that the cavity 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. 



RETENTION CYSTS. 



Retention cysts 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. — Sac- like 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 varying from pease to pigeon eggs, are 

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

 brane. They contain a sirup-like substance more or less thick and 

 transparent and whitish yellow in color. 



Treatment for mucous cysts. — Treatment consists in the puncturiug 

 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. 



