100 FISTULA AND POLL-EVIL 



the shoulder. This proved to be a typical cold 

 abscess involving these lymph nodes. 



Fistula Caused From Collar Sitfasts 



There is a type of fistula that differs some- 

 what from those just described. It is located 

 in front of the generally accepted limits of the 

 withers proper, and it exhibits certain etiologic, 

 pathologic and clinical differences that call foi 

 a special description and which require differ- 

 ent methods of management. 



This injury starts as a cutaneous collar le- 

 sion. It begins as a pressiu*e necrosis of the 

 skin alone but later involves first the pad of the 

 mane and then the funicular portion of the 

 ligamentum nucha? and even extends down- 

 ward into the lamellar portion, creating a very 

 troublesome condition to treat. 



When observed in the early stage of devel 

 opment, the seat of the collar at the level of 

 the mane where the thick skin is folded trans- 

 versely into several deep undulations, is found 

 to contain a black, smooth, hairless^ leather- 

 like, circular zone of insensitive integument 

 that is loosened slightly from the viable skin 

 all ai'ound its circumference, but which can not 

 be lifted off. It is attached and although some 

 time is given for it to separate, no such an event 

 occurs. It remains stubbornly attached. At 



