[Endonasal surgery of choanal atresia].

This paper was designed to study clinical manifestations of choanal atresia (CA) in 11 patients with a view to optimizing methods for medical and diagnostic management of this severe pathology using endonasal surgical techniques. Detailed analysis of possible causes of congenital CA and mechanisms of acquired CA was performed using computed tomography (CT) and retrograde endoscopy with the help of rigid optics. Potential of certain instruments designed and manufactured in Russia for the management of CA is demonstrated, such as retrograde 110o Sekunda endoscope and silicone horseshoe-shaped protectors. An original diagnostic algorithm is proposed allowing for the development of indications for surgical intervention, determination of its extent, and the choice of the post-operative treatment. Improved surgical instruments have been designed for the purpose. A case of hereditary CA in a child and his mother are presented along with results of treatment of nasopharyngeal scleroma in two patients. Clinical manifestations of CA concomitant with scleroma, diphtheria, and chemical chaonal burns are considered.