A 45 year old lady presents with history of double vision and facial numbness. Which anatomical site is most likely to be affected?

The key is D. Brain stem. [Cerebral cortex will not cause features of cranial nerve lesions. Trigeminal

nerve: ophthalmic and maxillary divisions are pure sensory hence it is also not the answer. Oculomotor

does not cause facial numbness. These features are not of basal ganglia lesion also. These features only

can be explained by cranial nerve involvement in brainstem lesion].