An AP atlas and axis projection obtained with the patient's face rotated toward the left side demonstrates
1)a narrower distance from the atlas's lateral mass to the dens on the right side than on the left side.
2)the upper incisors obscuring the dens and atlantoaxial joint.
3)the patient's jaw shifted toward the left side.
4)the atlas's spinous process shifted toward the left side.
A) 1 and 3 only
B) 2 only
C) 3 and 4 only
D) 1, 3, and 4 only

Question

Quizplus · Accepted Answer

Option 1 indicates a narrower distance from the atlas's lateral mass to the dens on the right side. Option 3 indicates that the patient's jaw has shifted to the left, which is visible on an AP atlas and axis projection obtained with the patient's face rotated toward the left side. Option 2 is not a valid observation in this context as upper incisors are not relevant in analyzing an AP atlas and axis projection. Option 4 is incorrect as a shift in the atlas's spinous process cannot be noted in an AP atlas and axis projection.

An AP Atlas and Axis Projection Obtained with the Patient's