橋底部梗塞により本態性頸部振戦が消失した1例

Disappearance of Essential Neck Tremor after Pontine Base Infarction

　左橋底部の梗塞の発症直後より，本態性頸部振戦が消失した41歳女性例を報告した。振戦は頸部にほぼ限局し，飲酒にて軽減し，家族歴を有していた。本態性振戦の病態は未だ明らかでなく，さらに本態性頸部振戦はβブロッカーが無効な場合が多く，手指振戦とは異なる機序が考えられている。本例の観察と，文献的考察から，両者とも共通のcentral oscillatorを有し，錐体路が頸部振戦の発現に関わっている可能性があると考えられた。

Mechanism of essential tremor remains unknown. Central oscillators, postulated in thalamus, inferior olive, and spinal cord are thought to be important to form rhythmicity, and finally to stimulate spinal or medullary motor cells, leading trembling muscle contraction, tremor. Among several subtypes of essential familial tremor, including hand tremor, neck tremor, and voice tremor, essential neck tre-mor is a common disorder, and its pathophysiology seems different from that of typical essential hand tremor, since patients with essential hand tremor are responsive to β blocker, whereas those with neck tremor are usually not.