Isolated third cranial nerve palsy: a rare presentation of neurocysticercosis.

Isolated third cranial nerve palsy is usually due to vascular causes like posterior communicating artery aneurysm and it is rare in neurocysticercosis. Third cranial nerve palsy in neurocysticercosis is usually caused by supratentorial or sub-arachnoid lesions with accompanying hydrocephalus or meningitis. We report a patient who presented with isolated third cranial nerve palsy without any other brainstem signs caused by neurocysticercosis involving the midbrain.