目的　探讨鼻咽癌放疗后局部复发的类型及其 MR表现。方法　选择鼻咽癌放疗后鼻咽腔粘膜正常 ,但鼻咽周围肿块复发者 2 4例 ,按常规及 Gd- DTPA增强后行 MR检查。结果　 1茎突前间隙复发 8例 ,7例伴有颅底和颅内侵犯 ;2茎突后间隙复发 2例 ;3颅底骨质破坏 7例 ;4鼻腔及筛窦复发 3例 ;5鼻咽腔粘膜下囊性复发 2例 ;6其他类型复发 2例。其中 15例还经病理证实 ,9例经再程放疗和追踪观察确诊。在 MR表现上除囊性复发 2例外 ,其余病例病灶在 T1加权像均呈稍低或等信号 ,T2加权像呈稍高信号 ,增强后有中等度以上强化。结论　鼻咽癌放疗后复发存在多种特殊类型 ,MR是检查鼻咽癌放疗后复发的较好方法 Objective To investigate the types of local recurrence of nasopharyngeal carcinoma after radiotherapy and its MR findings. Methods Nasopharyngeal mucosa was selected after radiotherapy of nasopharyngeal carcinoma. However, 24 cases of recurrence of nasopharyngeal masses were detected by routine and Gd-DTPA enhancement. Results 1 The anterior puncture recurrence in 8 cases, 7 cases with skull base and intracranial invasion; 2 2 cases of retro-styloid gap recurrence; 3 skull base bone destruction in 7 cases; 4 nasal and ethmoid sinus recurrence in 3 cases; 2 cases of submucosal cystic relapse in the pharynx and 2 cases of other types of recurrence in 6 cases. Of which 15 cases were confirmed by pathology, 9 cases were diagnosed by re-radiation and follow-up observation. In the MR manifestations, except for 2 cases of cystic relapse, the other cases showed slightly lower or equal signals in the T1 weighted images and slightly higher signals in the T2 weighted images, with a moderate enhancement above them. Conclusion There are many special types of recurrence after radiotherapy for nasopharyngeal carcinoma. MR is a better method to check the recurrence of nasopharyngeal carcinoma after radiotherapy