内翻乳头状瘤是向鼻穹窿内生长的良性上皮样肿瘤。在副鼻窦内很少见,尚不足此区域上皮肿瘤的4％。内翻乳头状瘤最常见于50～70岁老年人,男性发生率是女性的2～4倍。内翻乳头状瘤在CT上的表现具多样化,无特异性。最常见于鼻侧壁、邻近中鼻甲,向后达钩突。冠状CT扫描显示鼻内肿瘤最准确。肿块为软组织密度,可有钙化。注射对比剂后肿块呈不均匀强化。肿块大小从几毫米到10cm或更大。肿瘤增长可引起邻近骨壁变薄、变 The inverted papilloma is a benign epithelioid tumor that grows into the nasal dome. In the paranasal sinus are rare, not enough in this region 4% of epithelial tumors. Inverted papilloma is most common in the elderly aged 50 to 70, the incidence of men is 2 to 4 times that of women. Inverted papilloma in the performance of a variety of CT, non-specific. The most common in the nasal wall, near the middle turbinate, up to the uncinate process. Coronal CT scans show the most accurate intranasal tumor. Lumps of soft tissue density may have calcification. Injecting contrast agent was uneven mass enhancement. Lump size from a few millimeters to 10cm or more. Tumor growth can cause adjacent bone wall thinning, change