CLINICAL VETERINARY MEDICINE 

 AND SURGERY. 



PART I. 

 SURGICAL PATHOLOGY AND PRACTICE. 



L— DENTIGEROUS CYSTS IN THE TEMPORAL REGION. 



A FEW days ago our advice was sought concerning a horse which 

 showed on the temporal region, a little in front of and above the eye, a 

 soft, fluctuating, indolent swelling, which several of you thought to be a 

 simple cyst, and others took for a " cold abscess." The owner of the 

 horse having been offered several contradictory opinions as to the 

 nature of this swelling, and the proper method of treatment, had 

 hnally decided to send the animal here. 



On account of the position and character of the swelling, I at once 

 came to regard it as a dental or dentigerous cyst developed in the 

 temporal region, an abnormality of which you will probably not see 

 another example during the course of the present year. I was therefore 

 anxious to utilise the chance offered of drawing your attention to this 

 singular condition, the nature of which has long been known, but which 

 often escapes notice, although a number of cases have been described. 



Dentigerous cysts have been found in many species of animals and 

 in various organs, particularly in the genital region, in the ovary and 

 testicle. They are, however, specially common in the temporal region, 

 at the base of the ear, on the forehead, and in the sinuses. These 

 cysts have been divided into dental and radiculo-dental : in the latter, 

 which are rare, the root of the tooth projects towards the centre of 

 the cyst ; whilst in the former, which are more frequent, the crown 



A 



