TUAU)KS. 



:95 



found to be a cavernous hemangioma. The spaces in cavernous 

 hemangiomata are lined Ijy endothelium that is supported by a 

 very limited amount of white fibrous connective tissue, yellow 

 elastic tissue being practically absent. 



Fitc. 150. — Photog:raph of spleen of (log affected with an Hemangioma t'arveriiosiini. 



Heinaii'gioma hypcrtropliiciim is a blood-vessel tumor composed 

 of masses of relativeU' small \-essels, in which the vessel walls 

 are hypertrophied. One of these tumors occurring in the subcu- 

 taneous tissue of the metacarpal region of a horse has been 

 observed. It appeared as a mass beneath the skin and was 

 about the size of a hen's egg. Pulsations could be observed and 

 by palpation they were quite distinct. The tumor when removed 

 was a tangled mass of blood-vessels with comparativeh' small 

 openings. Microscopically, the vessel walls were found to be 

 hypertrophied. The vessels were held together by fibrous con- 

 aective tissue. 



Cirsoid aneurisms are tumors composed of dilated and enlarged 



