TUMOURS IN THE NASAL CAVITIES. 319 



On the 6th March the mare, which was on the way to complete 

 recovery, was returned home. 



TUMOURS IN THE NASAL CAVITIES. 



ig. Five-year- old terrier dog. Left in hospital on the 14th March, 

 1896. 



About two months before deformity of the face had been noticed. 

 On the right cheek, almost midway between the eye and point of the 

 nose, was a circumscribed, slightly painful swelling. A muco-purulent 

 discharge, streaked with blood, ran from the right nostril. Mastica- 

 tion seemed difficult ; the dog ate slowly, and frequently attempted to 

 scratch the nose. The swelling gradually became more marked. 



State on Entry. — The right side of the face showed a swelling as 

 large as an egg, apparently developed in the superior maxillary bone ; 

 over its centre the bone was destroyed, and throughout the rest of its 

 extent the external table appeared elevated. 



The tumour extended above as high as the eye, which however 

 appeared unaffected ; posteriorly as far as the lower maxilla ; it had 

 invaded the mouth and destroyed the right side of the hard palate ; 

 several loose molars were surrounded by the new growth. The buccal 

 portion of the tumour was in most places fairly firm, but showed local 

 ulcerations. 



Autopsy. — With the exception of its ends the right superior maxilla 

 was almost destroyed. The tumour extended about one eighth of an inch 

 above the level of the bone. After sawing through the centre of the 

 head the nasal septum was seen to be thrust towards the left by the 

 growth, which had destroyed the mucous membrane and turbinated 

 bones, and had completely filled the right nasal cavity. Within the 

 mouth it extended backwards as far as the base of the cranium ; the 

 anterior portion of the zygomatic and palatine bones and the body of the 

 superior maxilla, together with the right half of the hard palate, were 

 destroyed. Four molars (the crowns of which retained their white 

 colour) were only held in position by the new growth. The anterior 

 wall of the orbital cavity had disappeared, and the fibrous membrane 

 lining it had been thrust back, though it remained intact. 



The buccal and maxillary portions of the tumour were somewhat 

 firm ; the remainder was soft and friable. It was of an epithelial nature, 

 formed of a connective-tissue stroma containing irregular cavities 

 filled with small polyhedral cells. At certain points these cells 

 tended to assume a cylindrical form, and to run at right angles to 

 the stroma. In certain alveoli the central cells were large, contained 

 no nuclei, and were arranged in epidermal nests. 



20. Four-year-old sheep-dog. Brought for examination on the 

 15th December, 1892. 



Had been ill for eight months. The first symptoms consisted of 

 difficulty in breathing, frequent sneezing attacks, and discharge from 

 both nostrils. The animal scratched the nose with its paw, as if 

 attempting to remove some foreign body from the nostrils. Though 



