鼻咽癌常侵犯颅内或颅外周围的间隙和腔窦。CT扫描不仅能显示鼻咽腔的表层结构,并能清楚地显示病变的范围及肿瘤向鼻咽腔外蔓延的情况,为放射治疗设计提供了客观的依据。本文通过对六例有CT扫描的鼻咽癌病例的分析,进一步讨论了鼻咽癌向颅外侵犯的途径及合理的放射治疗设计。 Nasopharyngeal carcinoma often invades intracranial or extracranial space and cavities. The CT scan can not only show the superficial structure of the nasopharyngeal cavity, but also clearly show the extent of the lesion and the spread of the tumor to the nasopharyngeal cavity, providing an objective basis for the design of radiation therapy. In this paper, six cases of nasopharyngeal carcinoma with CT scan were analyzed to further discuss the way of extracranial invasion of nasopharyngeal carcinoma and rational radiation therapy design.