Which diagnosis describes autoimmune demyelination of the central nervous system?

• A. Multiple Sclerosis
• B. Parkinson's Disease
• C. Guillain-Barré Syndrome
• D. Myasthenia Gravis

Answer: (A)

Autoimmune demyelination of the central nervous system occurs when the immune system targets myelin in the brain and spinal cord, disrupting nerve signaling and causing focal neurologic deficits that recur over time. The presentation most classically associated with this process is multiple sclerosis, which shows episodes of neurologic disturbance separated in time and space due to demyelinating lesions in different CNS areas. The immune attack involves T cells and B cells forming inflammatory demyelinating plaques; imaging often reveals multifocal periventricular lesions, and CSF may show oligoclonal bands reflecting intrathecal IgG synthesis. Clinically, optic neuritis, motor and sensory deficits, and coordination problems are common. This pattern is distinct from Guillain-Barré syndrome, a peripheral demyelination; Parkinson’s disease, a neurodegenerative dopaminergic neuron loss; and myasthenia gravis, an autoimmune attack at the neuromuscular junction. Therefore, the diagnosis describing autoimmune demyelination of the CNS is multiple sclerosis.