316 



\i;ti:rinarv patiuuj )t;v. 



Melanotic sarcomata are frequently malignant. In an autopsy 

 of a "'rav mare metastases of melanosarconiata were found in the 

 liver, lung, spleen and kidney, the primary growth being located 

 in the subcutaneous tissue on the right superior portion of the 

 anus. Another case was observed in which there was general- 

 ized melanosarcomatdsis in a short-horn cow. 



Myxosarcoma. — Fliis is a tumor comirosed of myxomatous 

 and sarcomatous tissue. The existence of this group of tumors 



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171. — S<.ctiun or .^leluuo .^aiM-nina n f a hoi-si's Uvlt, showint;^ th'' 

 deposit uT nitlanin in thc' tumor cells 



is doubted b_v some pathologists l:)ecause sarcomata are prone to 

 undergo mucoid degeneration, and, because if tlie mucoid degen- 

 eration is of limited extent and generalized throughout the en- 

 tire tumor, differentiation would be practically impossible. If 

 the mucoid degeneration affects localized areas the differentia- 

 tion is not difficult. ( )ne myxosarcoma has been studied. It in- 

 volvefl tlie right lobe nf the liver of a cow but was not the cause 

 of death. The tunmr, about the size of a goose egg, was encap- 

 sulated, soft and pale pink in color. 



Microscopically it was composed of stellate cells, the pro- 

 cesses of which were apparently united, thus forming alveoli. 



