578 



PRINCIPLES OF VETERINARY SURGERY 



8. ANGIOMA. — The angiomata may be divided into two 

 groups : sanguineous angiomata or hjemangiomata' and 

 lymphatic angiomata or lymphangiomata. 



Haemangioma. — This tumor is due to dilatation and neo- 

 formation of the capillaries. Virchow describes two varie- 

 ties, simple and cavernous. Although rare in domestic ani- 

 mals, some cases have been observed in the horse. Trasbot 

 and Montane have each observed one case, and Lucet and 

 Bournay each describe a case in the dog. (Fig. 89). They 

 consist of small, soft tumors that have no tendency to gen- 

 eralize, but which are prone to rupture and cause death 

 from haemorrhage. 



Fig. 85. 



Cartilaginous Cells that Have Become Free in an Enchondroma after Having 



Undergone Mucoid Metamorphosis. Section of Hyalin Cartilage. 



Lymphyangioma.^ — ^These are formed by the anastomo- 

 sis of lymphatic vessels. They are exceedingly rare among 

 domestic animals and consist of flabby, succulent neoplasms.- 



NERVE TUMORS. 



I. NEUROMA. — Under the term "neuromata" must be 

 included the tumors formed entirely of new nerve tissue. 

 They have been found in the plantar nerves, the femoral, the 

 sub-zygomatic, the cranial nerves and in the brain. They 

 are divided into two groups: ganglionic and fasciculated. 

 Blanc has demonstrated that neoformations on the nerves 

 of ruminants should not be regarded as neuromata, but as 



