PRINCIPLES OF VETERINARY SURGERY 



581 



I. CYSTS. — Cysts are closed cavities having connective 

 tissue sacs lined within by epithelium. The cavity contains 

 products of different nature and aspect, distinguished as 

 serous cyst, mucoid cyst, sebaceous cyst and dermatoid cyst. 

 The latter refers to the position, while others indicate the 

 contents. 



Serous cysts have whitish contents that are slightly vis- 

 cous. They are single or multilocular, and are found in 

 the subcutem and in the walls of the tendbnous sheaths. 



Fig. 89. 

 Section o£ Cavernous Angioma. 



Fig. 88. 



Cavernous Angioma in the Neck of a 



Dog. A. Cavernous Spaces Filled 



with Blood. T. Fibrous Tracts 



Bounding the Spaces. 



The mucous cysts have a dermo-epithelial wall and are found 

 in the ovary, kidney, udder, testicle, liver, etc. The seba- 

 ceous cyst contains epidermic growths and hair follicles. 

 It is doughy, fat and chocolate colored. Dermatoid cysts 

 are very frequent in the horse and ox. They are particularly 

 noticed in the orbit, surface of the cranium, on the neck, 

 in the thoracic walls, about the maxillaries, and in the ova- 

 ries. The contents vary. Sometimes they contain a clear 

 liquid and at other times horn, cartilage, bones, teeth, etc. 



