Downbeat nystagmus simplified. 65 👩‍🦰 with new walking difficulty and dizziness. AMPAR Ab positive. WB PET CT negative. Improvement with Rituximab 1gm

Downbeat nystagmus simplified. 65 👩‍🦰 with new walking difficulty and dizziness. AMPAR Ab positive. WB PET CT negative. Improvement with Rituximab 1gm