Dizziness is often associated with lateral medullary infarction (LMI).
The characteristics of nystagmus in patients with post-LMI dizziness are unknown.
We undertook a prospective, comparative study of nystagmus in LMI patients.
We found the specific pattern of nystagmus only seen in patients with dizziness.
This pattern of nystagmus is the solely characteristic of post-LMI dizziness.