A PA cranial projection with accurate positioning demonstrates
1. equal distances from the lateral orbital margin to the lateral cranial cortices on each side.
2. the anterior clinoids and dorsum sellae superior to the ethmoid sinuses.
3. the petrous ridges horizontally through the lowest third of the orbits.
4. the internal acoustic meatus horizontally through the orbital center.
a. 1 and 2 only
b. 3 only
c. 1, 2, and 4 only
d. 1, 2, 3, and 4
C
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