48G TUMORS 



inflammation. A large part of the body may become affected in this 

 manner, that is to say, there is a gradual development of the process 

 through the entire body, these various tumors being supplied from the pri- 

 mary tumor or carried into the circulation and scattered in all directions, 

 forming new centres of development. We may see this occur in cancerous 

 masses in the liver, kidneys, and lungs, producing very little irritation 

 of the surrounding tissues beyond the central tumor, but we find that 

 the animal falls away quickly, becomes emaciated, has weak heart-action, 

 and presents all the symptoms of what is known as cancerous cachexia. 

 The prognosis is always unfavorable. Removal of a cancerovis 

 tumor may only be made when the neighboring lymphatic glands have 

 not become affected, and where the animal is in good nutritive condition. 

 Cases of ulcerated carcinoma must always be considered unfavoral^le, 

 except in the form of cancroid, which has been already described. The 

 treatment of cancer consists of speedy removal and keeping the animal 

 in as healthy condition as possible. 



6. The Myxoma. — A tumor made up of mucous or gelatinous connec- 

 tive tissue. They are apt to appear on the head and back, more than 

 any other place. They are frecpently multiple primarily, and sometimes 

 attain great size. The myxoma is a benign tumor, but it may recur after 

 incomplete extirpation. Usually these tumors are round or oblong, 

 clearly outlined in the tissue, are elastic on pressure, and they stand out 

 in the skin in semi-hemispherical elevations. The cut surface is pale, 

 moist, and exudes a thin, stringy mucous material when squeezed. 

 They are frequently found combined with fibroma and sarcoma. A 

 very characteristic example of myxoma is described by Velmalage, in 

 which he found from the neck to the root of the tail, as well as on both 

 sides of the thorax, the outer surface of the hind legs, and the anterior 

 region of the sternum, great numbers of nodules varying in size from a 

 pea to a hazel nut, or even as large as a walnut. 



7. The Adenoma. — One of the parenchymatous group of tumors, 

 composed of glandular epithelium, which may assunie either the type of 

 a tubular or an acinous adenoma. They always originate in some gland, 

 are either single or multiple, and can be distinguished from simple glan- 

 dular hypertrophy by the fact that they stand out prominently from 

 their surroundings, are knotty or scirrhous, or sometimes quite soft. 

 Their growth is slow and they are seen most frequently in the breast, 

 rectum, thyroid and ovary. Adenomata are not malignant, primarily, 

 but just as soon as the basement membrane is penetrated by the tumor, 

 it then becomes a carcinoma, malignant in character. Cystic degenera- 

 tion is probably the most common of the retrograde processes. When 

 they are superficial, we may have ulcei'ation taking place. 



8. The Angioma. — A tumor composed of blood vessels and their 



