TUMOURS OF THK NASAL CAVITIES. 



325 



hygienic precautions. The mouth, nasal cavities and eyes should fre- 

 quently be washed with antiseptic solutions. The stables should be freely 

 ventilated, and the floors and bed kept in the cleanest possible condi- 

 tion, etc. 



Whenever a case of gangrenous coryza is observed it should be 

 isolated, and the stables should most carefully be disinfected. 



TUMOURS OF THE NASAL CAVITIES. 



Apart from actinomycosis of the upper jaw, tumours of the nasal 

 cavities or of the sinuses are not frequent in bovine animals. They are, 

 however, occasionally met with, and present symptoms which must be 



Fig. 167. — Transverse section through the nasal cavities near 

 their centre (normal). 



carefully studied in order to avoid errors of diagnosis. Usually they 

 are of the nature of myxomata, more rarely of fibro-myxomata. 



Symptoms. The dominant symptom is difficulty in breathing, both 

 when moving and eating, a difficulty which is sometimes so considerable 

 as to cause snoring respiration or roaring. Nevertheless, examination of 

 the trachea and of the lung, visual examination of the lower portions of 

 the nasal cavities, and manual examination of the pharynx, larynx and 

 glottis give only negative results. It may even happen, as occurred in 

 the case from which the illustration herewith was taken, that percussion 

 of the maxillary sinus reveals normal resonance. 



In the case of tumours of small size the forehead is not deformed. 

 When, on the other hand, the tumour partly obstructs the nasal cavities it 



