16. Paranasal sinuses radiograph, lateral projection
In this view there is superimposition of the paired maxillary sinuses and of
the paired groups of ethmoid air cells. Note that the roof of the maxillary
sinus is the floor of the orbit. Note also that the floor of the
maxillary sinus is contiguous with the roots of the upper jaw premolars and
molars, so pain from one region can be referred to the other, and infection
can track from one to the other. In this patient the third upper molar appears
impacted, i.e., its complete and normal eruption seems unlikely due to its position
against the second molar.
