Barnick 1897年首次报导了圆窗膜的损害及其可能的原因。在S t rohm(1982)80例外淋巴瘘的文献综合报告中,95%的病人有难听,73%有眩晕,耳鸣占49%,47%的病人有上述全部症状。患者的病史常具体提示有外淋巴瘘。耳镜检查常无病变发现,偶可见中耳有液平面。由于诊断性咽鼓管吹张,有将空气经过瘘口压入迷路的危险,故应属禁忌。文献中关于外淋巴瘘的术前诊断方法报导很多,但均非绝对可靠,对可疑病 Barnick first reported in 1897 the damage of the round window membrane and its possible causes. In the synthesis report of 80 cases of extraperitoneal lymphatic fistula in Springholm (1982), 95% of the patients had objectionable hearing, 73% had dizziness, 49% had tinnitus, and 47% had all the above symptoms. The patient’s medical history is often prompted specifically lymphatic fistula. Otoscope often found no lesions, even visible in the middle ear liquid level. Due to diagnostic Eustachian tube blowing, the air fistula pressure into the lost through the risk, it should be taboo. Literature on preoperative diagnosis of perilymph fistula many reports, but are not absolutely reliable, the suspicious disease