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
发育畸形有
，
分因放射治疗导致后鼻孔周围黏膜组织伤害引起纤
化形成。
化，纤
;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发育畸形有，分因放射治疗导致后鼻孔周围黏膜组织伤害引起纤化形成。
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