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为探讨左喉返神经受左上肺癌转移性淋巴结肿块压迫的声像图间接征象，对１２例中央型左上肺癌伴声音嘶哑患者进行了检测，取心底短轴主肺动脉窗切面探测左肺动脉与主动脉弓下之间导管韧带外缘即左喉返神经经过处。结果：以左肺动脉受肿块压迫的表现，间接提示左喉返神经压迫征，分别来自主动脉弓下肿大淋巴结３例；左主支气管上肿大淋巴结５例；原发癌与左上肺尖后段支气管淋巴结融合形成肺门肿块４例，全部病例经纤维支气管镜活检病理及Ｘ线、ＣＴ、ＭＲＩ对照证实。
To investigate the indirect features of the left recurrent laryngeal nerve by the ultrasonography of the metastatic lymph node mass in left upper lung cancer, 12 patients with central left upper lung cancer and deaf-muteness were examined. The short-axis main pulmonary window was taken to detect the left pulmonary artery and the aortic arch. Between the outer edge of the catheter ligament, the left recurrent laryngeal nerve passes. RESULTS: The compression of the left pulmonary artery was indirectly prompted by the recurrent laryngeal nerve compression syndrome, which was obtained from 3 cases of aortic arch lymph node enlargement; 5 cases of left main bronchial enlargement lymph node; primary cancer and left upper lung tip bronchial bronchus. Lymph node fusion formed hilar masses in 4 cases. All cases were confirmed by fiberoptic bronchoscopic biopsy and X-ray, CT and MRI contrasts.