338 VETERINARY PATHOLOGY. 



Dermoid cysts, those resulting from inclusion of cutaneous 

 tissue. These have been discussed under the head of teratomata. 



Secondary Changes. — The cystic wall may become the seat of 

 inflammatory disturbances, neoplastic formation or necrosis. In 

 some instances cj'Sts are destroyed because of the disintegration 

 of their capsule, bv disease. 



The cystic contents may undergo degeneration, become in- 

 spissated or calcified. 



Effects. — The effects of cyst formation depend upon the 

 tissue involved and the size and nature of the cyst. The cysts 

 frequentlv become so large that the entire organ is destroyed, 

 e. g., ovarian and renal cysts. In some cases the cysts may 

 destroy life, especially if a vital organ, e. g., the brain is in- 

 volved. Cysts may persist for years and be of no serious con- 

 sequence, on the other hand thev mav seriously inconvenience 

 the functional activitv of the part involved and impair the health 

 of the animal from the beginning. 



