我们曾对2例经颞入路三叉神经根切断术后三叉神经痛复发的患者,改用枕下入路而发现了病因,现报告如下。例1 女,64岁。患者无神经系统阳性体征的三叉神经痛1年零4个月。1976年12月经颞施行左三叉神经根切断术。术后疼痛发作停止。左面部三叉神经第三枝全部及第二枝部分分布区感觉缺失。1978年3月左舌及右面部疼痛复发,虽经药物治疗,不能缓解。次年7月入院检查发现左面部三叉神经第三枝分布区感觉缺失,两侧听力减退,余无特殊。1979年8月取左枕下入路手术。术中发现:内听道附近有1×1cm大小肿瘤,包膜完整,岩静脉横跨其上。切断岩静脉之后,见肿瘤嵌于天幕裂孔处,前缘压迫三叉神经根。切除肿瘤,保留三叉神经,病理切片报告:化学感受器瘤。术后患者疼痛解除,面部感觉缺失区及 We have on 2 cases of transient trigeminal nerve root after trigeminal nerve root recurrence after trigeminal neuralgia patients, switch to suboccipital approach and found the cause, are as follows. Example 1 female, 64 years old. Trigeminal neuralgia in patients without signs of nervous system 1 year and 4 months. In 1976 December by the temporal left trigeminal nerve root transection. Postoperative onset of pain stopped. Left facial trigeminal third branch and the second part of the distribution of sensory loss. In 1978 March left tongue and right facial pain recurrence, although after drug treatment, can not be alleviated. The following year in July admitted to the hospital found that the left trigeminal nerve distribution of the third branch of feeling of missing, hearing loss on both sides, I no special. August 1979 take the left suboccipital approach. Intraoperative findings: there are 1 × 1cm tumor size within the auditory canal, complete capsule, veins across it. After cutting the veins, see the tumor embedded in the cantilevered hole, the leading edge of the trigeminal nerve root compression. Excision of tumor, preservation of trigeminal nerve, biopsy report: chemosensory tumor. Postoperative patients with pain relief, facial sensory loss areas and