ABSTRACT Stiff-Person syndrome is a rare neuro-immunological condition predominantly affecting proximal and axial limb muscles, with a higher incidence in females aged between the third and seventh decades of life. Ophthalmological involvement is a significant aspect, often correlated with cerebellar dysfunction and various nystagmus forms. A 53 year-old female with a history of hypothyroidism and rectal polypectomy, presenting with diplopia, dizziness, and postural instability, eventually diagnosed with Stiff-Person syndrome. Treatment involves medications like diazepam and gabapentin, besides intravenous immunoglobulin therapy […]