3,- J 



VETERINARY PATHOLOGY. 



sarcomata or carcinomata and is composed of tissue similar to ad- 

 renal tissue. They occur most frequently in the kidney, ovary, 

 or adrenal body itself. Hypernephromata are rarely di;ignosed 

 as such in living domestic animals. They are variable in size, fre- 

 quently weighing as much as five kilograms (11 lbs.) Usually 

 grav in color and invariably containing hemorrhagic areas they 

 thus appear mottled. There is usually an encapsulating mem- 

 brane present. Blood-vessels are numemus, especially in the 

 stroma. Degeneration and necrosis is of common occurrence. 





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Fig. 183. — H.-i pernf pliroma of the kidnty of an ox. showing large« typical hjptrne- 

 phromatous ells containing fat ilropiets. 



Microscopically, these tumors are found to be made up of 

 large cells similar to epithelial cells and usually containing fat 

 droplets. These cells are arranged in rows or columns, the 

 columns being separated from each other by a small amount of 

 stroma. The columns of cells may be quite variable in their 

 diameter, appearing at times as long, slender columns and again 

 as rather long nests of cells. The stroma is composed of fibrous 

 connective tissue and contains many blood-vessels. 



Clinically, these tumors are very malignant, and, although 



