The main CT features included (1) Locations: 15 lesions located in the anterior portion of nasal cavitie at single side, and extended posteriorly along the inferior and/or media nasalis concha.

• CT表现：(l)发病部位：均为单侧发病，15例发生于鼻腔前部外侧壁，主要累及中下鼻甲，肿块多沿鼻甲形状蔓延生长，1例肿瘤主要位于鼻后孔；