314 



veti-:rinarv pathology. 



from four to six weeks after the operation with growths larger 

 than those present before the operation. The operation was 

 .usually repeated two or three times with the same results. 



(jn microscupic examination these growtlis were found to be 

 fibrrisarcomata, l^ieing ci imposed principally of fil)rous connective 



~T~1 



Oft^' I 



J. .t.aftxtg.'aia^ . 



Fig li;'j. — I'hnlumaph t?i)iA\-inL; ."Melauotit- UHinir suiJuiior Lo anus 



tissue ni wliich there were some spindle cells and occasionally a 

 few round cells. The presence of both fibrcius and sarcomatous 

 tissue is the principal characteristic of these tumors. The num- 

 ber, size and distribution of l^lood vessels are very irregular. 



These tumors are not distinctly encapsulated, l)Ut they do not 

 form metastases. They are prone to recur after ablation. They 

 ma}^ destroy life after a considerable time, as their growth is 



