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820 PART 6: Neurologic Disorders

FIGURE 86-22. Images of hypertensive encephalopathy or posterior reversible edema syndrome (PRES). A. Unenhanced head CT in a patient with hypertensive encephalopathy. Arrows
(black) pointing to the regions of the end-arterial border zones and changes consistent with ischemia and hemorrhage are visible. B. MRI in a 34-year-old postpartum female who presented
with gradual onset of headache, confusion, and seizures with associated relative hypertension. FLAIR sequences show bilateral frontoparietal foci of subcortical hyperintense signal during the
acute presentation (left) and regression of the lesions (and normal examination) 6 weeks later (right).

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Complete references available online at www.mhprofessional.com/hall

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