Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine, Nagoya.
Department of Otorhinolaryngology, Nishio Municipal Hospital, Nishio.
Otol Neurotol. 2021 Jul 1;42(6):e643-e647. doi: 10.1097/MAO.0000000000003073.
To investigate the clinical features of ears with dilatation of the endolymphatic space in the ampulla of the posterior semicircular canal on magnetic resonance imaging.
Retrospective study.
A university hospital.
This study included 1,842 ears from 934 patients who underwent 3-T magnetic resonance imaging with gadolinium to investigate the presence of endolymphatic hydrops. Age, sex distribution, hearing thresholds on pure-tone audiometry, and vestibular symptoms were compared between cases of unilateral and bilateral dilatation of the endolymphatic space in the ampulla of the posterior semicircular canal.
Forty-eight ears (17 men and 14 women; mean age 49.9 yrs) showed dilatation of the endolymphatic space in the ampulla of the posterior semicircular canal. Age and the rate of chronic sensorineural hearing loss were significantly higher in the unilateral group (14 ears) than in the bilateral group (34 ears). The average hearing thresholds and rates of vestibular symptoms reported did not differ between unilateral and bilateral cases, but some patients showed positional nystagmus.
Dilatation of the endolymphatic space in the ampulla was observed selectively in the posterior semicircular canal, though its pathogenesis was not clear. Such dilatation is not usually accompanied by vestibular endolymphatic hydrops, and it may be a cause of vertigo and dizziness.
研究磁共振成像中后半规管壶腹内内淋巴间隙扩张的耳部临床特征。
回顾性研究。
一所大学医院。
本研究纳入了 934 例患者的 1842 只耳朵，这些患者均接受了 3T 磁共振成像加钆造影，以调查内淋巴积水的存在情况。比较了单侧和双侧后半规管壶腹内淋巴间隙扩张的病例之间的年龄、性别分布、纯音测听听力阈值和前庭症状。
48 只耳朵（17 名男性和 14 名女性；平均年龄 49.9 岁）表现出后半规管壶腹内内淋巴间隙扩张。单侧组（14 只耳朵）的年龄和慢性感觉神经性听力损失的发生率明显高于双侧组（34 只耳朵）。单侧和双侧病例的平均听力阈值和前庭症状发生率没有差异，但有些患者出现位置性眼球震颤。
尽管其发病机制尚不清楚，但在后半规管中选择性地观察到内淋巴间隙扩张。这种扩张通常不伴有前庭内淋巴积水，可能是眩晕和头晕的原因。
