Choanal Atresias

《英文msh詞典》Choanal Atresias
[入口詞] Choanal Atresias
[主題詞] Choanal Atresia
[英文釋義] Congenital bony or membranous occlusion of one or both choanae,due to failure of the embryonic bucconasal membrane to rupture.