126 VETERINARY DENTAL SURGERT. 



mare seven years old and well bred, the property of 

 Mr. Clark, of White, Dakota. There had been a dis- 

 charge of pus from a fistulous opening opposite the 

 superior maxillary sinus which appeared several 

 months previous to my being called to see the case. 

 Prior to the discharge there had been a gradual 

 bulging of the bones of the face over the region 

 just described. On passing a flexible metalic probe 

 into the fistulous opening it met with some resistance 

 under the bones forming the walls of the sinus. By 

 moving the probe it passed over considerable sur- 

 face which appeared rough and indented. I was 

 unable to correctly diagnose the condition which 

 existed, believing it to be some form of a bony 

 tumor or an exfoliated portion of bone. I next 

 examined the mouth and found the teeth all in a 

 healthy and natural condition. 



An opening was made with the trephine over 

 the diseased portion of the sinus, and the diseased 

 cavity was exposed to view. A rather large tumor- 

 ous appearing substance was noticed but could not 

 be thoroughly examined owing to the interference 

 of the blood. The tumor was detached with a 

 heavy pair of cutting forceps and on examination 

 proved to be an imperfectly formed molar tooth, 

 with its crown nearest the external wall of the sinus. 

 The wound was dressed and directions left for 

 future treatment and a request to report the results 



