1.Choanal atresia is often related to the presence of a congenital abnormality and only a few cases involve the occurrence of mucosal fibrosis of the surrounding choana after trauma.

1.摘要后鼻孔闭数与先天性发育畸形有关，少部因放射治疗导致后鼻孔周围黏伤害引起纤维化形成。