Sample question 1
Light-near dissociation accompanied by impaired upgaze most strongly localizes to which region?
- AOptic chiasm
- BCavernous sinus
- COrbital apex
- Dorsal midbrain
Explanation
Light-near dissociation with vertical gaze dysfunction is classic for dorsal midbrain syndrome. Lesions in this region can also cause lid retraction and convergence-retraction nystagmus.