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

畸形有关,少部分因放射治疗导致后鼻孔周围黏膜组织
害引起纤维化形成。
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与生理 
生理学篇 
生理学篇 
生理学篇 
生理学篇 Surrounding the mucosal layer is the submucosal layer, made of loose areolar connective tissue, which helps provide the elasticity that the tube needs when you eat a whole pizza in one sitting, and it contains more blood vessels.

层周围是
下层,由松散的乳晕结缔组织组成,这有助于提供管子所需的弹性(比如说当你一次吃一整块比萨饼时),它包含更多的血管。