Chiari I 型畸形患者頸部伸展誘發的下跳性眼震

// Downbeat Nystagmus Induced by Neck Extension in Chiari I Malformation

44歲女性反覆眩暈僅於頸部後仰誘發，常規體位測試無眼震｜加入頸椎伸展即重現下向眼震（DBN）｜腦MRI顯示Chiari I（小腦扁桃體向下移位），作者認為為動態顱頸壓迫而非單純重力相關中樞前庭病變，提示應重視頸位誘發與影像學評估以指導診療。

// They report a 44-year-old woman with recurrent vertigo triggered by neck extension, evaluated with bedside ocular motor exam, positional testing, video-oculography, and brain MRI. Conventional positional maneuvers did not elicit nystagmus, but reproducible downbeat nystagmus occurred only when cervical extension was added (or during active seated extension). MRI showed cerebellar tonsillar herniation (Chiari I), and the authors conclude that extension-triggered positional DBN reflects dynamic craniocervical compression rather than a gravity-dependent central vestibular disorder.

Published 2026年9月16日