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.

摘要后鼻孔闭锁大多数与先天性发育有关，少部因放射致后鼻孔周围黏膜组织伤害引起纤维化成。