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We performed 99mTc-HMPAO SPECT in a patient during transient global amnesia and twice thereafter.SPECT during the attack showed a significant diminution of regional blood flow in the left thalamus and a less marked diminution in the right thalamus.Quantitative evaluation of global 99mTc- HMPAO uptake indicated a diffuse depression of cerebral blood flow,At follow-up to 40 days after the attack,global uptake and thalamic flow indices normalized,but there was a persistent reduction of left frontal flow values. |
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