THE MICROSCOPE IN PATHOLOGY. 



279 



which exhibit malignancy are ossified sarcomata or ossi- 

 fied cancers. 



i. Other Forms Analogous to Connective Tissue Type. 



1. Sarcoma. Fibro-plastic or fibro-cellular tumor. It 

 belongs to the group of connective substance tumors by 

 some of its affinities, but is to be distinguished by the 

 greater development of its cellular elements. All the 

 sarcomata consist of embryonic connective tissue, and the 



FIG. 225. 



Round-celled sarcoma, a. Vascular lumina. b. Parenchyma partly brushed out, so 

 that-the hardened baais-substauce appears as an elegant network. 1-300. After KIND- 

 FLEISCH. 



several varieties are dependent on the size and shape of 

 the cells and the nature of the intermediate substance. 

 They include what are termed recurrent, fibroid, and mye- 

 loid tumors. 



(1.) Round-celled sarcoma is allied to granulation and 

 embryonic tissues (page 262). 



a. The granulation-like round-celled sarcoma, of soft con- 

 sistence, containing embryonic cells in a homogeneous or' 

 finely granular intercellular substance. 



