中文摘要：

鼻腔／鼻窦内翻性乳头状瘤（sinonasal invert—edpapilloma，SNIP）是一种黏膜上皮源性肿瘤，占全部鼻腔鼻窦肿瘤的0．5％～4．0％，其临床特征是有复发倾向、破坏周围解剖结构和骨质重塑以及与鳞状细胞癌相关。术后复发率为15％～20％，SNIP恶变及伴发鳞状细胞癌的发生率约为10％。

英文摘要：

Sinonasal inverted papilloma （SNIP） is one of the most common benign sinonasal tumors demon- strating a high recurrence rate after surgery, and sometimes presents malignant tendency or coexists squamous cell carcinoma. Therefore, it is essential to achieve complete surgical resection, especially the original location of SNIP. In this paper, we evaluated the predictability of preoperative CT and magnetic resonance imaging （MRI） for localization of SNIP origin.