TUMORS. 

 FIG. 312. 



351 





Lipoma of the kidney. (Birch-Hirschfeld.) The boundary between the adipose tissue of 

 the tumor and the renal tissue is not sharply defined. The former occupies the middle 

 of the section and extends to its lower edge. 



fibrous tissue. When they apparently spring from bone their true 

 origin may be from small remnants of cartilage which have escaped 



the normal ossification. 



FIG. 313. 





m 



i 



Chondrosarcoma of the rib. (Ilansemann.) The lower portion of the section is exclusively 

 sarcomatous. The upper part contains cartilaginous tissue, but there are a few spindle- 

 shaped cells in the matrix similar to those in the sarcomatous portion of the growth. 



Cartilage is a not infrequent constituent of mixed tumors, espe- 

 cially of the parotid gland or testis, when it is usually associated 



