94 PBINOIPLES OF VETEBlNAEY SUEGERY 



extent, interfere witli the function of a part, giving rise td 

 lameness and pseudo stringhalt. 



Mow do you treat heloids. 



They are best left alone, excision executed lege artis often 

 being foUo-wed by a larger keloid than the one which was 

 extirpated. 



What is elephantiasis ? 



A connective tissue hyperplasia of the subcutis and skini. 

 In what animal is it most commonly seen 9 



Hind legs of the horse. 



What are the causes of elephantiasis 9 



Chronic stasis of the venous circulation, and more fre- 

 quently a chronic indurating inflammation of the skin and 

 subcutis, such as follows lymphangitis, purulent cellulitis 

 and the more serious forms of dermatitis about the lower 

 extremities. 



Sow do you treat elephantiasis ? 



No successful therapeutic agent is known. 



What is a tyloma ? 



It is a diffused callosity of the skin originating in tha. 

 subcutis, representing a connective tissue hyperplasia. 



What are the causes of tylosis ? 



Continuous irritation, as from the collar, traces, har- 

 ness, etc. 



ITame the seats of predilection. 



In the horse, those parts irritated by the harness, as thd 

 neck, breast., etc. ; in the ox, the knee ; in the dog, the point 

 of the elbow and ischial tuberosity. 



