Abstract
ATRESIA of the posterior nares is a congenital obstruction in the nose, situated at the junction of the hard and soft palate. This atresia completely closes off the posterior choana, preventing on that side the passage of air from the nose into the nasopharynx. There are two definite types, complete bony atresia and incomplete bony atresia. It is possible that a third type exists, which I call partial atresia. A complete bony atresia is one in which the atresia is completely bony. An incomplete bony atresia is one in which the atresia, although complete in form, is partly bony and partly membranous in structure. I consider a partial atresia one which has one or more openings in it and which may be completely or incompletely bony. The experience gained in developing the technique for the correction of an atresia of the posterior nares is based on two cases. One case

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