TUMOURS IN THE FACIAL SINUSES AND CANCER OF THE SUPERIOR MAXILLA. 27 



The case we have just seen is that of a gelding about fifteen years 

 old. Six months ago it showed gradual swelling of the upper left 

 maxilla. A veterinary surgeon who was consulted considered this 

 due to injury, and prescribed treatment, but without success. The 

 swelling slowly increased, mastication became difficult, and the breath 

 from the left nostril stank. These symptoms had existed about two 

 months before the animal was brought to our clinique. 



The most striking feature at first glance was the asymmetry of the 

 face. The cheek muscles were atrophied. The prominence of the 

 masseter, usually so well marked, had disappeared, and was replaced 



<-^'^<fi/^ 



Fig. 5. — Pavement-celled epithelioma of the maxilla. Transverse section of the 

 face in front of the fifth molar. 



by a distinct depression. In the region of the superior maxilla, 

 between the zygomatic process and the orbital cavity, was a tumour as 

 large as a man's fist, uniformly hard except at its centre, where the 

 skin had ulcerated, and allowed of fungous vegetations protruding. 

 Examination of the parts was painful, and caused the animal to 

 struggle. From the left nostril ran a grumous offensive discharge^ 

 the amount of which increased with exercise. The lymphatic glands 

 in the submaxillary space were enlarged, a little indurated and 



