History: A 60-year-old man presents with neck pain.
1. What should be included in the differential diagnosis? (Choose all that apply.)
e. Atlantooccipital assimilation
2. McGregor’s line is drawn between which anatomic landmarks?
a. Posterior edge of the hard palate and the opisthion
b. Posterior edge of the hard palate and the undersurface of the occipital squamosal surface
d. Tuberculum sella and basion
3. All of the following neural axis abnormalities are associated with basilar invagination except:
4. All of the following are causes of basilar impression except:
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