CORTICAL BLINDNESS AFTER CORRECTION OF SYMPTOMATIC HYPONATREMIA - DYNAMIC CEREBRAL-DYSFUNCTION VISUALIZED USING SERIAL SPECT SCANNING

A 70-yr-old woman developed cortical blindness after correction of hyp onatremia. Regional hyperperfusion was noted on SPECT scans obtained i n the acute phase. One month later when symptoms had largely resolved, a repeat examination was normal. This regional hyperperfusion, which was not associated with any apparent structural damage, may have repre sented either luxury perfusion or a transient increased metabolic requ irement of the dysfunctional cortical area. SPECT scanning may be a us eful method to study cerebral dysfunction resulting from an osmotic di sturbance.