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Posterior reversible encephalopathy syndrome in an eclamptic patient.

Patients frequently present with seizures, encephalopathy, and visual changes.

Predominantly vasogenic edema is seen in the occipital white matter and posterior fossa. Gray matter may be involved. More anterior frontal and temporal lobes are less frequently involved.

The most accepted theory is the brain loses its ability for vasoregulation in response to extreme elevation of blood pressure or certain drugs. The posterior circulation structures are more susceptible to involvement by the process.