The anterior walls of sphenoid sinus located on the superior border of choanae, between nasal septum and middle nasal turbinate.
蝶窦前壁位于后鼻孔上缘上，鼻中隔和中鼻甲后缘之间。
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Method: The clinical data of 19 patients with radio-atresia of choanae treated by transnasal endoscopic surgical plastic procedure were analyzed retrospectively.