[Causes of restenosis in the surgical treatment of congenital choanal atresia in children].

Endoscopic transnasal choanotomy with intraoperative rhino- and epipharingoscopic imaging, which is performed taking the individual characteristics of the anatomy of the anomalous zone into account, is the most optimal surgical procedure in pediatric patients. In combination with the use of a protector with a distal extended zone, high efficiency and rarity of restenosis are achieved.