鼻腔和鼻窦内翻性乳头瘤是一种少见病,其病因不明,命名混乱,易于复发,有恶变倾向。我院从1966年8月至1985年4月共收治20例,均经病理切片证实。现报道如下。一、临床资料(一)性别与年龄20例中男性15例,女性5例,男;女=3:1。与 Skolnik(1966)报道33例,男:女=4:1相近。发病年龄16岁1例,20～40岁5例,41～60岁10例,60岁以上4例;40岁以 Inverted papilloma of the nasal cavity and paranasal sinuses is a rare disease. Its cause is unknown, its name is disordered, it is easy to relapse, and it has a malignant tendency. In our hospital from August 1966 to April 1985, a total of 20 cases were treated and confirmed by pathological section. The report is as follows. First, clinical data (a) gender and age of 20 cases of 15 males, 5 females, male; female = 3:1. Thirty-three cases were reported with Skolnik (1966), with men and women equal to 4:1. The age of onset was 16 years old in 1 case, 20 to 40 years old in 5 cases, 41 to 60 years old in 10 cases, and over 60 years old in 4 cases; 40 years old