304 



VETERINARY PATIIOLOCV. 



[)hosarcoma was found in a post-mortem examination of a sheep. 

 An omental 1} inpliosarcoma in a dog' was reported in the Ameri- 

 can W'terinarv Re\ie\v, December, 1005. The color, consistency 

 and size of lymphosarcomata is quite variable. 



Alicroscopicallv these tumors are found to be composed of 

 Ivmphoid cells, the tumor cells being supported by stellate cells. 

 L"vmp]i "\-essels are usualU- quite numerous and their structure is 

 similar, if not identical, to that of normal lymph vessels. The 

 stellate supporting cells and the presence of lymph vessels are 

 the distinguishinq- characteristics of lymphosarcomata. There 

 is no leucocytosis in animals affected with lymphosarcomata, 

 while in those atTected with leukemia leucoc}-tosis is well marked. 



These tumors are malignant. They form metastases through 

 the lymph and blood channels. They are usually surrounded by 

 a verv thin capsule. 



f 'jif— PhntoKraph of a mule affected with a spindle cell Sarcoma n! trie eyelids 

 -.ninular denuded lumornus surface. 2. Granular funfroid tumorous mass. 



