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胆脂瘤直接侵犯迷路造成破坏已被认为是一种对内耳功能的严重威胁。作者报道12例迷路受到广泛破坏而术前听力仍好者。经术前CT显示及术中证实,12例中5例为中耳胆脂瘤,7例已侵及颞骨,迷路受损至少累及2个半规管。5例所有半规管有病理改变,6例前庭受累,1例胆脂瘤恰好侵蚀3个半规管、前庭、内淋巴管及椭圆囊,2例胆脂瘤影响耳蜗基底转及上半规管和外侧半规管或后半规管。术前、术后遮蔽的骨导值为频率0.25、0.5、1、2 KHz听阈的平均值,12个病例术前骨导值5dB～22dB间(平均16dB),术后5个病例耳蜗功
Cholesteatoma direct invasion of the damage caused by the loss has been considered a serious threat to the inner ear function. The authors report that 12 cases of lost patients were extensively damaged and their preoperative hearing was good. The results of preoperative CT and intraoperative confirmed that in 12 cases, 5 cases of middle ear cholesteatoma, 7 cases have been infiltrated and temporal bone, lost at least involving two semicircular canal. Five cases had pathological changes of all semicircular canal. Six cases had vestibular involvement. One case of cholesteatoma exactly eroded three semicircular canal, vestibular and endolymphatic vessels and oval capsule. Two cases of cholesteatoma affected cochlear basal turn and upper and lower semicircular canal or posterior Semi-regulatory. Preoperative and postoperative masking of the bone conduction values for the frequency 0.25,0.5,1,2 KHz hearing threshold average, 12 cases of preoperative bone conduction value between 5dB ~ 22dB (average 16dB), postoperative 5 cases of cochlear function