During a 3-year period, nine girls and two boys (age range, 2 days-13 years) with congenital choanal atresia were evaluated by computed tomography (CT). Other associated congenital anomalies, primarily craniofacial anomalies, were present in six of the 11 patients. In six patients the atresia was bilateral and consisted of both bony and membranous components. Of the five patients with unilatera...