上半规管裂综合征

定义

上半规管裂综合征（SCDS）是指上半规管上的骨质变薄或开裂，在CT上表现得最为明显，使得上半规管和颅内空间之间压力传递。当巨大声音或中耳或颅内压力的变化刺激耳道时，可能发生眩晕和眼球震颤。对骨传导声音的听觉过敏（恐声症）可导致传导性听力损失、脉动性耳鸣或自声过强（听到自己身体的声音很响或失真）。虽然骨缺损可能是先天性的，但头部外伤可能是打开功能上移动性迷宫窗的最后一步。

Superior canal dehiscence syndrome (SCDS) occurs when thin or dehiscent bone over the superior semicircular canal, best demonstrated on CT, allows pressure transmission between the canal and the intracranial space. Vertigo and nystagmus may occur when the canal is stimulated by loud sounds or changes in middle ear or intracranial pressure. Hyperacusis to bone-conducted sounds can cause conductive hearing loss, pulsatile tinnitus, or autophony (hearing one’s own body sounds as loud or distorted). While the bony defect may be congenital, head trauma can be the final step that opens a functionally mobile labyrinthine window.

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• 上半规管裂综合征