What criteria indicates a properly positioned PA skull?

petrous pyramids half fill orbits
petrous pyramids fill entire orbits
petrous pyramids fill three quarters orbits
petrous pyramids project superior to the orbits


petrous pyramids fill entire orbits

Rationale: The OML should be aligned perpendicular to the IR. With the chin tucked the petrous pyramids will shift more superior and fill the orbits entirely. Petrous pyramids should not push superior to the top of the orbits, this would indicate overflexion of the part.

Health Professions

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