Institut für Radiologie, Klinikum r. d. Isar, TU München, Ismaningerstr. 22, 81675, Munich, Germany.
Eur Arch Otorhinolaryngol. 2012 Feb;269(2):475-80. doi: 10.1007/s00405-011-1688-6. Epub 2011 Jul 8.
The literature about bony defects in the semicircular canal system is highly inconsistent. Therefore, we analyzed a series of 700 high-resolution multislice CT examinations of the temporal bone for semicircular canal dehiscencies. An unselected group of ENT patients with different clinical symptoms and variable age was chosen. We found semicircular canal dehiscence in 9.6% of temporal bones, superior semicircular canal was affected mostly (8%), less common posterior semicircular canal (1.2%); only in 3 cases (0.4%), lateral semicircular canal showed dehiscence. In 60% of SSC dehiscence, we registered bilateral manifestation. The so-called "third mobile window" in semicircular canal dehiscence causes a great variety of clinical symptoms like vertigo, nystagmus, oscillopsies, hearing loss, tinnitus and autophonia. Comparison with anatomic studies shows that CT examination implies the risk of considerable overestimation; this fact emphasizes the important role of clinical and neurophysiological testing.
关于半规管系统骨缺损的文献存在很大差异。因此，我们分析了 700 例颞骨高分辨率多层 CT 检查的一系列结果，这些患者来自不同临床表现和不同年龄段的 ENT 患者。我们发现 9.6%的颞骨存在半规管裂，其中上半规管（8%）最常受累，后半规管（1.2%）较少见，仅 3 例（0.4%）外侧半规管受累。60%的 SSC 裂患者表现为双侧病变。所谓的“第三活动窗”在半规管裂中引起各种临床症状，如眩晕、眼球震颤、眼震电图、听力损失、耳鸣和自声增强。与解剖研究的比较表明，CT 检查存在明显高估的风险；这一事实强调了临床和神经生理学测试的重要作用。
