296 MANUAL OF EQUINE MEDICINE. 



Treatment. — Even in the most favourable instances there 

 is little profit to be derived from keeping hydrocephalic 

 foals, as they are mostly very weakly, badly developed, and 

 do not thrive well. 



TUMOURS IN CONNECTION WITH THE 

 CEREBRAL STRUCTURES. 



TUMOURS IN CONNECTION WITH THE CRANIAL 

 WALLS. 



EXOSTOSES. — Osseous tumours, or ivory osteomata, have 

 sometimes been met with growing from the internal, and 

 also from the external, plates of the cranial bones of horses. 

 They generally grow from the internal surface of the tem- 

 poral bones, and are rounded, nodulated, and sometimes 

 pedunculated. 



They are hard and dense, being composed of compact 

 ivory-like tissue, containing osseous corpuscles, but no 

 Haversian canals or blood-vessels. 



In some cases they become detached from the cranial 

 walls, and lie loose in the cranial cavity. 



TUMOURS IN CONNECTION WITH THE BRAIN AND 

 ITS MENINGES. 



1. TUMOURS OF THE CHOROID PLEXUS.— Abnormal 

 growths in connection with the choroid plexus of the lateral 

 ventricles are the most frequently encountered of all cerebral 

 tumours in the horse. 



They sometimes involve one of the plexuses, sometimes 

 both, and are frequently symmetrical on both sides of the 

 brain, not only in position, but in size also. 



These tumours develop very slowly, and do not occasion 



