576 



PRINCIPLES OF VETERINARY SURGERY 



6. OSTEOMA. — The osteomata are constituted of defi- 

 nitely organized osseous tissue, and are distinguished from 

 osteoid growths by the fact that in the latter the osteoblasts 

 are not transformed into osteoplasts. Osteomata are fre- 

 quent in the horse and the dog. Le Blanc et al. have reported 

 cases which they have observed. They are found in the 

 nasal cavities or their appendages, and have only indirect 

 relations with the bones. They are covered with the mucous 



Fio. 82. 

 Lipoma of the Mammse of a Dog (Ball and P. LeBlanc) . 



membrane and are constituted of a hard or cancellated os- 

 seous tissue. 



7. LYMPHADENOMA.— The structure of the lympha- 

 denoma is similar to that of a lymphatic gland. These tu- 

 mors are rather frequently observed in veterinary practice, 

 according to the observations of Jobelot, Peuch et al., whose 

 descriptions would indicate that they are connected with 

 leucocythsemia or some other microbian affection. In the 

 ox, for example, cases of chronic pneumo-enteritis may be 



