TUMORS. 



CAETILAGINOUS TUMORS. 



265 



These are generally seen on the sternum, or upon the ribs. To 

 the touch these tumors are hard and dense, but present a slight 

 elasticity. When on the sternum they interfere with the ani- 

 mal's movements, causing him to move with the four legs wide 

 apart. The tumor is generally fastened to the bony wall and in- 

 vested by the periosteum, which is generally thick and over- 

 grown. When cut into they present a pinky white appearance, 

 with gritty points of ossification. 



Teeatment. — The only method is their removal by excision. 



We have seen crusta petrosa tumors in connection with the 

 teeth, but these are seldom seen, and never give rise to any incon- 

 venience. 



Calcarious tumors consist of a deposit of calcarious salts in 

 various parts of the body. They are found in the brain of the 

 horse, in the testicles, and the nerves. 



OSSEOUS TUMORS. 



These are common in the neighborhood of joints where the 

 articular surface is affected with caries, and sometimes surround- 

 ing the tendons of the limb. They result in the ossification of an 

 exudate, which has been formed in consequence of some inflam- 

 mation. 



CYSTIC TUMORS. 



These are formed by enlargement and fusion of the spaces or 

 areola of the connective tissue. In these spaces fluid accumu- 

 lates, and gradually the boundaries of the spaces are leveled 

 down and walled in till a perfect sac or cyst is formed, the walls 

 of which continue to secrete. Some cysts are formed by dilata- 

 tion and growth of natural ducts or saculi, as arc those sebaceous 

 or epidermal cysts, which, foi-mod by hair follicles, have perma- 

 nent openings. Serous cysts arise in two ways — from effects of 

 pressure and without evident cause. Examples of the first are 



