According to literature, the average age of children with unilateral atresia of the choan is six years nine months. Unilateral complete atresia of the choan makes it difficult to diagnose early: the initial diagnosis can be established in the second year of life and later, already at school age. In Russian and foreign literature in recent years, cases of diagnosing congenital atresia of choanomas in older children are known, the maximum age of children is 17—18 years, it is noted that such cases are very rare. The article describes the case of congenital unilateral complete bone atresia of the choan in a woman of 30 years. The patient underwent a complete otorhinolaryngological examination and endoscopic choanotomy with the installation of a silicone stent in the hole formed.