TUMORS. 



299 



inse. Metastases are frequent in the lungs, li\cr and kidney. 

 iMetastatic sarcuniata are usnall)- eireuniseriljed. 



Sub-surfaee sarcuniata may produce necrusis (jf the surface 

 tissue, the tumor projecting as a red, granuhir mass, which ap- 

 pears very similar to exul)erant granulation. The surface tissue 

 may not be destroyed, the tumor appearing as a sub-surface 

 nodule or ditTuse mass. Some sarcomata are encapsulated and 

 are easily enucleated, but the malignant varieties ha\e nei cap- 

 sule and it is impossible to differentiate the surrounding tissue 

 from that of the tumor. Sarcomatous tissue may be si_ift and 

 spongy or hard and dense, depending upon the extent of the 

 intercellular substance and the kind of cells composing it. in 

 color thev varv from gray or white to pink and thc\- may be 

 mijttled, depending upon hemorrhage, pigmentation, or necrosis. 

 I'he microscopic appearance \-aries with the ditierent \'arie- 

 ties, but in general they are composed oi embryonic cells lia\"ing 



pj,, i-I Photograph of .a hors^- affected with Sarcoma of the i\Te<llaKtiiumi 



in" in obstructed circulation. 



(a) OedPiiia inferior tlioracic reirion. 



(b) .luir lirvein eu^nv^eA witli blood. 



(c) Subcnt;ineous veins. 



