AKT-5427
A 39-year-old plumber visits his GP complaining of increased clumsiness at work that has been getting worse over the past 6 months. He reports difficulty finding tools and has fallen multiple times due to tripping over his own feet. The patient has well-controlled type 1 diabetes and is in good health otherwise. He is not taking any medication other than insulin and has no family history of illness. During the examination, the GP notes absent ankle jerks and extensor plantars, but sensation is normal. What could be a potential cause for the patient’s symptoms?