Isolated Third, Fourth, and Sixth Cranial Nerve Palsies from Presumed Microvascular versus Other Causes

Purpose To estimate the proportion of patients presenting with isolated third, fourth, or sixth cranial nerve palsy of presumed microvascular origin versus other causes. Design Prospective, multicenter, observational case series. Participants A total of 109 patients aged 50 years or older with acute isolated ocular motor nerve palsy. Testing Magnetic resonance imaging (MRI) of the brain. Main Outcome Measures Causes of acute isolated ocular...