SCDS can occur when some part of the bone protecting the superior semicircular canal is missing.

当保护上半规管的部分骨头缺失时，SCDS就会发生。

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Essentially, the missing piece of bone in McLeish's left ear was allowing the superior semicircular canal to respond to sound and pressure in abnormal ways.

基本上， McLeish左耳骨头的缺失部分让上半规管对声音和压力做出了异常反应。

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Methods: The blue line of superior semicircular canal went through the mill and correlative structures were measured on 24 cases of wet cranial bone specimens(48 sides) .

方法：采用福尔马林固定的头颅标本24具（48侧），首先寻找弓状隆起并磨出上半规管蓝线，进一步测量其与内耳道及相关结构的位置关系。

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