发生于上颌窦内的黏膜下囊肿,尤其是底壁及前下壁的囊肿,因其位置较深,常规30°或70°镜于中鼻道开窗处进入不易窥见囊肿全貌,特别是当囊肿破裂后其原发部位更难以寻找,以致囊肿壁切除不全而复发。临床上常规于下鼻道开窗或经中鼻道联合及经上颌窦前壁切除上颌窦黏膜下囊肿[1-3 Submucosal cysts in the maxillary sinus, especially in the bottom wall and the anterior inferior wall of the cyst, because of its location, conventional 30 ° or 70 ° in the middle of the nasal opening window is not easy to glimpse the whole picture of the cyst, especially when Cyst rupture of the primary site more difficult to find, resulting in incomplete recurrent cyst wall resection. Clinically routine in the inferior nasal fenestration or by the combination of the middle and nasal sinus and maxillary sinus anterior resection of maxillary sinus submucosal cyst [1-3