الفهرس 
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Abstract
Choanal Atresia is complete obliteration of the posterior nasal aperture with incidence of 1 in 5000–7000 live births. It is more often unilateral than bilateral (60% vs 40%).
Historically 90% of atresia have been described as bony, while the remaining 10% are membranous.
The most commonly used methods for correcting this condition are the endoscopic trans-nasal approach, the trans-septal approach and the trans-palatal approach. Piezo-surgery has the ability to cut mineralized tissues without cutting neurovascular tissues and other soft tissues.
Our study was carried out at the Otorhinolaryngology Department of Beni-Suef University’s Hospital during the period from January 2019 to January 2021.
The study was carried out on 20 patients with unilateral bony or bony membranous choanal atresia and showed that all the 20 cases underwent removal of the bony atretic plate, preservation of muco-periosteal flaps with no intraoperative complications.
The mean operative time was 42.2±2.1 minutes and all the patients were followed up in a period ranging from 6 months to 2 years duration.
The study showed 75% success rate with patent nasal choana in 15 patients out of total 20 cases. Restenosis and re-closure of the choana occurred in 5 patients with failure rate was 25%.