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
形有关，少部分因放射治疗导
后鼻孔周围黏膜组织伤害引
化形成。
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形有关，少部分因放射治疗导后鼻孔周围黏膜组织伤害引化形成。
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