[Eeprinted from The Journal of Comparative Merlieine and A'^eleriuary Arcliives, 



May, 1S97.] 



ATRESIA OF THE RIGHT POSTERK^R NARIS IN A MARE. 

 By W. L. Williams, V.S., 



PROFESSOR OF SURGERY, NEW YORK STATE YETERIXAI:Y COLLEGE. 



The subject, a small brown mare, aged four years, u^ed for de- 

 livery by a retail butcher, had been recently purchased without a 

 reliable history as to the date of the advent of respiratory diffi- 

 culty, but it was said that she had suffered from an increasing 

 dj'spnosa for about one year. 



As this is the date at which the animal would ordinarily be first 

 put to work, in all probability the difficulty in breathing was 

 merely not noticed until brought out prominently by labor. 



Presented at the free clinic, October 9, 1896, it was observed 

 that rapid driving caused severe dysi.>ncea and roaring, while at 

 rest the respiratory sounds were normal, Ijut the ingress and egress 

 of air were confined wholly to the left nostril, the right being func- 

 tion! ess. 



Inspection revealed no facial deformity, no definite dulness nor 

 want of resonance over any of the facial sinuses, no nasal discharge 

 or odor, no cough, and no abnormality upon manual exploration 

 of the mouth and pharynx. 



The symptoms observed, in conjunction with the history of a 

 gradually developing dyspncea of a year's duration, led us to believe 

 that we had to deal with a neoplasm encroaching upon the right 

 nasal conduit. 



On the following day the animal was cast and two exploratory 

 openings made — one into the inferior maxillary sinus, near the 

 fang of the fourth molar; the other against the median line of the 

 face, on a level with the lower margin of orbits. No abnormality 

 could be discovered from either, except that the turbinated bones, 

 normal in structure, approached more nearly to the septum nasi 

 than usual, until an attempt was made to pass a sound from the 

 second opening through the posterior naris, wiiich was found 

 impossible. 



After a proloiT^ed <-^ort and the use of as great force as seemed 

 prudent the souuu suddenly passed through into the pharynx, and 



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