目的　探讨永存颈内-基底动脉吻合的影像学特点, 提高对此类异常吻合血管的认识。  方法　回顾性分析12例经头颈CT血管造影(CTA)及MR血管造影(MRA)诊断为永存颈内-基底动脉吻合患者的影像学资料。其中9例病人行头颈联合CTA检查，3例行头和/或颈部MR血管造影(MRA)检查。  结果　12例中，9例为永存三叉动脉，3例为永存舌下动脉。永存三叉动脉中，外侧型8例，内侧型1例；按Saltzman分型Ⅰ型3例，Ⅱ型2例，Ⅲ型4例；吻合点近端的基底动脉及双侧椎动脉发育不良4例，吻合点近端基底动脉完全萎缩1例；1例合并动脉瘤，2例合并大脑中动脉成窗。3例永存舌下动脉中，2例伴同侧椎动脉缺如，1例伴对侧椎动脉发育不良，1例伴对侧椎动脉发育不良及成窗变异。  结论　（1）CTA及MRA能清晰、快速、准确地显示永存三叉动脉和永存舌下动脉等颈内-基底动脉吻合的走行、毗邻关系及其合并症；（2）熟悉这些原始吻合血管的特征有助于指导临床制定合理的治疗方案，提高相应治疗中的安全性。

Objective　To explore the imaging characteristics of persistent carotid-basilar artery anastomoses in an effort to improve our understanding of this anomaly.　Methods　9 craniocervical CT angiography(CTA)，3 cranial and/or cervical MR angiography (MRA) in 12 patients of persistent carotid-basilar artery anastomoses were retrospectively reviewed.　Results　These 12 patients had 9 persistent trigeminal arteries and 3 persistent hypoglossal arteries. Based on the position of the persistent trigeminal artery, 8 patients were the lateral type, 1 was the medial type. According to the configuration of the ipsilateral posterior cerebral artery, 3 cases were Saltzman typeⅠpersistent trigeminal arteries，2 cases were Saltzman typeⅡ，4 were Saltzman type Ⅲ. The veretral artery and basilar artery caudal to the anastomosis with the trigeminal artery were hypoplastic in 4 cases. And 1 case showed the basilar artery completely artopied. 1 case associated with an aneurysm of the persistent trigeminal artery, 2 cases associated with fenestration of contralateral middle cerebral artery. 2 of 3 persistent hypoglossal arteries showed ipsilateral vertebral arteries completely artopied and 1 associated with hypoplasia of the contralateral vertebral artery, 1 associated with hypoplasia and fenestration of the contralateral vertebral artery.　Conclusions　CTA and MRA could rapid, intuitive, and accurate demonstrate the course of persistent carotid-basilar artery including the trigeminal and hypoglossal arteries, adjacent structure and the coexisting abnormalities. Diagnosis these variants prior to surgery and intervention may be helpful for procedures choice and decreasing the risk.