THE FACE, MOUTH AND PHARYNX 197 



may be drilled upwards through its socket into the sinus, (b) 

 The lateral wall of the inferior meatus of the nose may b 

 down and the sinus opened into through its base, (c) The upper 

 lip may be everted and the muco-periosteum incised over t 





FIG. 58. Empyaema of Maxillary Sinus. 



canine fossa. A hole is then drilled through the bone, lateral 

 to the ridge produced by the root of the canine tooth, 

 drill were applied to the medial side of the ridge, the inferior 

 meatus of the nose would be opened into instead of the sinus. 

 Malignant tumours arising from the muco-periosteal lining 

 of the maxillary sinus are not uncommon, and the symptoms to 

 which they give rise depend on the direction in which they grow. 



