Choanal atresia is a condition consisting of a closure of one or both posterior nares by a complete or incomplete membranous, osseous or membrano-osseous partition. It is usually of congenital origin, although some authors doubt this. It is certain that in those cases which are not congenital the lesion must be the result of some severe chronic infection near the posterior nares, which results in subsequent formation of a cicatrix. The latter cases cannot be classified as true choanal atresias.
The total number of reported cases of this interesting condition is still so small that the further report of such cases is desirable. In 1923, Lebensohn1 had collected 170 cases, which included one of his own. The total number of cases reported up to the present time probably does not exceed 180.
Lebensohn found that the occlusion was of the osseous type in 90 per cent of the
W. E. GROVE. CHOANAL ATRESIA AND SINUS INFECTION. Arch Otolaryngol. 1927;6(3):237–241. doi:10.1001/archotol.1927.00610010253005