中文摘要：

目的 探讨鼻腔鼻窦小细胞神经内分泌癌的CT和MRI表现。方法 回顺性分析7例经病理证实鼻腔鼻窦小细胞种经内分泌癌的CT（7例）和MRI（1例）资料。结果 6例小细胞神经内分泌癌位于鼻腔鼻窦，累及单侧或双侧副鼻窦，其中5例侵入眼眶，3例做坏前颅底骨侵犯颅内；1例局限于左侧后鼻腔。鼻腔鼻窦小细胞神经内分泌癌密度或信号不均匀，但强化显著，窦壁骨以侵蚀性破坏为主，部分合并膨胀性骨质破坏。4例随访，其中3例6-18个月死亡，另外1例术后复发。结论鼻腔鼻窦小细胞神经内分泌癌常同时累及鼻腔及多个鼻窦，浸润性生长为主，易向眼眶和颅内侵犯，增强后显著强化。

英文摘要：

Objective To study the CT and MRI features of sinonasal small cell neuroendocrine carcinoma（SNEC） . MethodsThe CT and MRI findings of seven patients with pathologically proved SNEC in the sinonasal region were retrospectively reviewed. All seven patients underwent CT and four of them underwent MRI scan. Results The lesions located in the bilateral or unilateralnasal cavity and paranasal sinuses in 6 cases , and the lesion of 1 case was confined to the left posterior nasal cavity. The lesions in- vaded orbit in 5 cases, and 3 of them damaged the anterior bastion and invaded intracranial. CT density or MRI signal of the SNECwithin nasal cavity and paranasal sinuses was inhomogeneous, but significantly enhanced. The lesions within maxillary and sphenoid sinuses showed expansion and erosion. Four patients were followed up. Three of them died after 6 months to 18 months, and one patient reoccurred after operation. Conclusion Small cell neuroendocrine carcinoma often involve the nasal cavity and several parana- sal sinuses simuhaneously, which was always infiltrative growth, tend to invade orbital and intracranial structure.