Myoma, 357 



vagus nerve trunk abont the middle c)t the neck; the other was 

 found by Kolessnikow, growing in the tail and perianal con- 

 nective tissue of a twenty-year-old stallion, a tumor containing 

 pigment cells {rhabdoniyosarcoina melanodes), which had given 

 rise to numerous metastases in the liver, spleen, peritoneum and 

 pleura. 



The Icioiiiyoina is found more frequently and in easily recog- 

 nized forms in animals: in case of extensive combination with 



if. f > t«- "^ 













/ 



^*-%«- 



^*«» 



Fig. 97. 



Leiomyoma (from utei-us) : «. ijlace shuwlng buadle of muscle fibres cut transversely. 



tibrous connective tissue, as may sometimes be seen, the growth 

 is spoken of as a myofibroma. These tumors always develop 

 in a structure rich in smooth muscle, and are consequently met 

 principally in the muscular wall of the uterus and vagina (in cow 

 and hog, less frequently in the dog), of the intestine and stomach 

 (horse), urinary bladder (dog), now and again in the testis 

 (horse), and in the subcutaneous tissue (horse). They are 

 rounded or globular, firm tumor masses, which are sometimes 

 found projecting from their places of origin, covered over 

 smoothly with mucous or serous membrane, presenting on their 



