366 



Tumors. 



tissue. Those forms of sarcoma whose cells do not grow with any 

 special uniformity, but rather as a motley mass of various forms in 

 atypical embryonal proliferation, cannot of course be named from 

 the cellular character. These instances, as a rule, represent the 

 malignant form of fibroma, chondroma, osteoma or melanoma, or 

 are mixed tumors ; in these cases a combined expression is used. 

 The completely developed tissue forms, as it were, the framework or 

 stroma, and the cells the parenchyma. 



(@ 





g/»* ^® J 





.%.. 



V i 





3^ 



• t%r^ 



■^:.;''"^c>5 7 





Fig. 102. 

 Alveolar round cell sarcoma, from testicle (human). 



The principal types of sarcoma may be divided as follows : 

 A — Cellular Sarcomata: the round cell sarcoma, spindle cell sar- 

 coma, giant cell sarcoma, stellate cell sarcoma, polymorphocellular 

 sarcoma. 



B — Combined Sarcomata: the fibrosarcoma, liposarcoma, chon- 

 drosarcoma, osteosarcoma, myxosarcoma, myosarcoma, gliosarcoma, 

 lymphosarcoma, melanosarcoma. 



In stricter application it would be well to determine precisely, as Borst 

 and Diirk have urged, whether the embryonal cells were present from the 



