随着调强放射治疗的发展,对于鼻咽癌放疗靶区的精确勾画越来越受到临床医师的重视。沿神经周围浸润[1](Perineural Invasion,PNI)是鼻咽癌转移较为隐匿的方式,鼻咽癌有无PNI预示着其是否向颅内侵犯,直接影响着分期、放射治疗的范围、治疗疗效的评价及预后。由于PNI位置较深,并且症状出现较晚,甚至可能没有症状,故而临床较难发现;因此影像诊断特别是CT、MRI在PNI的诊断中起着重要作用[2]。 With the development of IMRT, more and more clinicians pay more and more attention to the accurate delineation of the radiotherapy target area of ​​NPC. Perineural Invasion (PNI) is a more insidious way of nasopharyngeal carcinoma metastasis. The presence or absence of PNI in nasopharyngeal carcinoma predicts whether intracranial invasion of nasopharyngeal carcinoma directly affects the staging, the scope of radiation therapy, and the therapeutic efficacy Evaluation and prognosis. Because of the deep PNI location, and the late appearance of symptoms, or may even have no symptoms, it is more difficult to find clinically; therefore, imaging diagnosis, especially CT and MRI plays an important role in the diagnosis of PNI [2].