rUMORS. 



317 



There were also round cells, some areas being composed almost 

 entirely of round cells and others of stellate cells. The round 

 cells were like the round cells found in sarcomata. The alveoli 

 formed by the stellate cells were filled with a stringy mucus ma- 

 terial. A few blood vessels were observed but thev were not as 

 numerous as in pure sarcomata. 



These tumors may he malignant. When they occur upon or 

 near available surfaces they usually become necmtic, slough and 

 produce no further tn_iuble. 



Fig ]7l'. — t^i-ction of a .^l.^'xo-Sarcoma, from a foWs livrr, shnwins 



1. Spaces formed hy the union of the processes of the stellate cells. 



2. S'arcoma ceils. 



Chondrosarcoma and tumrirs composed of chondromatous and 

 sarcomatous tissues are not common. They usually occur in 

 the location most favorable f(ir chondromata. A chicken affected 

 with a choniirosarcoma of the sternum was obtained at a butch- 

 er's stall at the citv market in Kansas City recently. 



Alicroscopicall}', these tumors are found to be composed of a 

 mixture of chondromatous and sarcomatous tissues in varying 

 proportions. Sometimes the chondromatous tissue is apparently 

 stroma for the sarcoma tissue proper. In other cases the Stroma 

 is apparently formed of sarcomatous tissue and the chondro- 

 matous tissue is the essential portion of the tumor. 



