Traumatic oculomotor nerve palsy: Unique case of isolated mydriasis and ptosis following head injury

A rare case of partial cranial nerve 3 (CN3) paresis following a traumatic brain injury presented with isolated ptosis and mydriasis due to a hemorrhagic lesion in the ipsilateral tegmentum of midbrain. All the extraocular muscles that control eye movements were spared. The anatomy of CN3 nuclei and their fascicular organization is reviewed.