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症例は,単純ヘルペス脳炎後の57歳男性で抗ウイルス薬の投与を受けずに自然軽快し,後遺症として,著明な前行性健忘,数年にわたる逆行性健忘,ならびに性格変化,滞続言語(行為)が持続し,脳炎回復後数年を経過した時点でも全く改善が認められていない。本症例は(1)数少ない自然軽快例であり,(2)MRI上,大脳辺縁系にほぼ限局した傷害がみられ,とりわけ両側側頭葉内側部が選択的にほぼ完全に破壊されているという特徴が認められた。大脳辺縁系の中でも殊に両側側頭葉内側部に対して強い親和性を示すという単純ヘルペスウイルスの特異な"neurotropism"の存在の可能性を強く示唆する症例であると考えられた。
A 57-year old man, who had suffered from herpes simplex encephalitis and had been cured without antiviral agents, was admitted to our hospital three years after the encephalitis. He had a complete loss of memory for events subsequent to the encephalitis and a retrograde amnesia for the several years leading up the encephalitis. MRI revealed the abnormalities located in the limbic system, espe-cially the medial portions in the bilateral temporal lobes of the cerebrum were completely destroyed. We consider that this case suggests the specific affinity of herpes simplex virus especially for the medial portions in the temporal lobes of the cere-brum.
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