Brantberg Krister, Bagger-Sjöbäck Dan, Mathiesen Tiit, Witt Hanne, Pansell Tony
Department of Audiology, Karolinska Hospital, Stockholm, Sweden.
Otol Neurotol. 2006 Jun;27(4):531-4. doi: 10.1097/01.mao.0000201433.50122.62.
To compare audio-vestibular findings caused by a dehiscence of the posterior semicircular canal with those found in the superior canal dehiscence syndrome.
Case report.
University hospital, tertiary referral center.
The 44-year-old woman suffered from a gradual hearing loss with pulse-synchronous tinnitus as well as sound and pressure-induced vertigo.
Audio-vestibular testing and high-resolution computed tomography.
The superior canal dehiscence syndrome is caused by failure of normal postnatal bone development in the middle cranial fossa leading to absence of bone at the most superior part of the superior semicircular canal. The typical features for this syndrome are sound- and pressure-induced vertigo with torsional eye movements, pulse synchronous tinnitus and apparent conductive hearing loss in spite of normal middle-ear function. We present a patient with very similar symptoms and findings who, instead, had a posterior semicircular canal dehiscence caused by an apex cholesteatoma.
Patients with semicircular canal dehiscence have common auditory-vestibular features regardless of which of the two vertical semicircular canals is affected. The only obvious difference between the two is the vertical component of the sound and pressure-induced eye movements (which beats in opposite directions).
比较后半规管裂开引起的听觉前庭表现与上半规管裂综合征的表现。
病例报告。
大学医院，三级转诊中心。
一名44岁女性，患有逐渐加重的听力损失，伴有与脉搏同步的耳鸣以及声音和压力诱发的眩晕。
听觉前庭测试和高分辨率计算机断层扫描。
上半规管裂综合征是由颅中窝出生后正常骨发育失败导致上半规管最上部无骨质引起的。该综合征的典型特征是声音和压力诱发的伴有扭转性眼球运动的眩晕、脉搏同步性耳鸣以及尽管中耳功能正常但明显的传导性听力损失。我们报告了一名具有非常相似症状和表现的患者，但其后半规管裂开是由胆脂瘤型中耳炎引起的。
无论两个垂直半规管中的哪一个受到影响，半规管裂开的患者都有共同的听觉前庭特征。两者之间唯一明显的区别是声音和压力诱发的眼球运动的垂直分量（其方向相反）。
