118 PKINOIPLES OP VETEBINAEY SUBGSBY 



Are adenomata absolutely innocent f 



They are not ; there seems to be a slight tendency to a. 

 conversion into carcinomata. 



Describe the adenoma. 



They originate from a secreting gland ; are of variable 

 size ; are encapsulated ; single, but may be multiple ; are of 

 slow growth and do not disseminate. Usually they are firm 

 to the touch unless cysts have developed in them; appear^ 

 usually as mixed tumors, being rare as pure adenomata. The 

 acinous form is made up of acini, which communicate with 

 each other by duct-like channels, the acini being lined with 

 spheroidal epithelium. The tubular adenoma is composed of 

 tubules lined with cylindrical epithelium. 



How common are they in animals ? 



On the whole they are not often seen, excepting the 

 adenoma of the thyroid gland of young dogs (stroma hyper- „ 

 plastica simplex) ; more rarely in the horse. 



Give the treatment of adenomata. 



In animals the hyperplastic stroma, especially in the dog, 

 is about the only form of adenoma coming into consideration. 

 In the horse removal of the thyroid is well borne, while in the 

 dog removal of both lobules leads promptly to death in four 

 to five days after the operation. The removal of one lobe (the 

 largest one) is also well borne by the dog. In the dog, there- 

 fore, internal medication with iodide of potassium with 

 external iodine application, or injections of diluted tincture 

 of iodine, is employed with fair results. 



Cysts. 



What is a cyst ? 



It is a bag-like neoformation, containing either fluid or 



