Years after measles infection, a rare CNS complication that can occur is:

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Years after measles infection, a rare CNS complication that can occur is:

Subacute sclerosing panencephalitis is a rare, progressive brain disease that appears years after a measles infection due to persistent measles virus activity in the central nervous system. The long delay is key: SSPE typically begins with subtle behavioral or cognitive changes and then advances to myoclonus, seizures, motor decline, and dementia over months to years. Diagnosis is supported by high measles antibody levels in cerebrospinal fluid and blood, characteristic EEG findings, and MRI-detectable demyelination. There is no cure; management is supportive, and prognosis is poor, though treatment may include antiviral or immunotherapy approaches in some cases. Prevention hinges on measles vaccination, which eliminates the risk of SSPE. The other listed conditions do not fit the timing. Guillain-Barré syndrome is a peripheral nervous system demyelinating process that occurs days to weeks after an infection or vaccination, not years after measles. Meningitis and acute encephalitis are typically acute illnesses presenting soon after exposure or infection, not as late sequelae of a prior measles infection.

Subacute sclerosing panencephalitis is a rare, progressive brain disease that appears years after a measles infection due to persistent measles virus activity in the central nervous system. The long delay is key: SSPE typically begins with subtle behavioral or cognitive changes and then advances to myoclonus, seizures, motor decline, and dementia over months to years. Diagnosis is supported by high measles antibody levels in cerebrospinal fluid and blood, characteristic EEG findings, and MRI-detectable demyelination. There is no cure; management is supportive, and prognosis is poor, though treatment may include antiviral or immunotherapy approaches in some cases. Prevention hinges on measles vaccination, which eliminates the risk of SSPE.

The other listed conditions do not fit the timing. Guillain-Barré syndrome is a peripheral nervous system demyelinating process that occurs days to weeks after an infection or vaccination, not years after measles. Meningitis and acute encephalitis are typically acute illnesses presenting soon after exposure or infection, not as late sequelae of a prior measles infection.

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