TUMORS. 



317 



interstitial haemorrhages. Some of these vascular sarcomata were for- 

 v Tnef1y~"cIassed together with other kinds of vascular tumors as fungus 

 hseniatodes. Some of the forms of epulls are giant-celled sarcomata. 



FIG. 156. GIANT-CELLED SARCOMA OF BONE. 



When these tumors originate in the marrow of the long bones, which 

 is a favorite place for them, they are apt to cause resorption of the bone ; 

 and although the tumor may be for a long time enclosed by a shell of 



' x**%>. 



&SSa>> 



FIG. 157. OSTEO-SARCOMA. 



new-formed bone, which enlarges with the enlarging tumor, it usually, 

 sooner or later, breaks through this and infiltrates adjacent tissues. 

 They are liable to form metastases and frequently grow to a very great 

 size. The periosteal forms are apt to be firmer in texture, and are prone 



