Chiari type I malformation: a mimicker of myasthenia gravis.

Introduction: Myasthenia gravis is an autoimmune disease, which commonly presents with extraocular muscle weakness, eyelid ptosis, bulbar dysfunction, and proximal limb weakness. We report an unusual differential diagnosis for myasthenia gravis.

Case Report: A 56-year-old woman presented with worsening blurry vision, double vision, eyelid droopiness, slurred speech, and fatigable limb weakness, worsening over a 6-month period.