Case Presentation A 34-year-old male with no prior neurological or significant medical history presented with a chief complaint of progressive left-sided weakness and numbness over a duration of three days. History of Present Illness Symptoms began with: Burning pain on the left side of the neck radiating to shoulder and arm Followed by a pruritic vesicular rash in C3–C4 dermatomal distribution Initially diagnosed as herpes zoster and treated with valacyclovir Despite treatment, neurological symptoms progressively worsened No history of: Visual disturbances Cognitive impairment Balance issues Past Medical & Social History No chronic illnesses No regular medications No smoking, alcohol, or drug use No significant family or travel history Physical Examination Vitals : Stable, afebrile Skin : Vesicular rash over left neck extending to mid-back (dermatomal pattern) Neurological findings:…