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The Facial Bones


THE ORBITS

FIGURE 2-1, Normal asymmetry of the lesser wings of the sphenoid.

FIGURE 2-2, Pneumatization of the anterior clinoid processes simulating enlargement of the optic canals.

FIGURE 2-3, Bilateral congenital absence of the orbital processes of the zygoma.

FIGURE 2-4, Two examples of absence of the medial walls of the orbits, a finding of no clinical significance.

FIGURE 2-5, Simulated fracture through zygomaticofrontal suture produced by a slight rotation of the head.

FIGURE 2-6, Unusual appearance produced by extension of a sphenoidal air cell into the greater wing of the sphenoid.

FIGURE 2-7, Normal asymmetry of the superior orbital fissures (←). Note also the asymmetric density of the sphenoidal wings and the apparent loss of the superior medial aspect of the right orbital rim ( ).

FIGURE 2-8, Periglobal fat, simulating air in the orbits (←). Note also the shadow of the closed eyelids ( ).

FIGURE 2-9, Two examples of the infraorbital groove simulating a fracture of the floor of the orbit. The patient on the right has left maxillary sinusitis.

THE PARANASAL SINUSES

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