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Choanal atresia is a developmental failure of the nasal cavity to communicate with nasopharynx. It can be membranous or bony; unilateral or bilateral; complete or incomplete. Bilateral choanal atresia is less common and usually present in neonatal period with severe respiratory distress. Imaging provides definitive diagnosis by choanography. This report shows the value of computed tomography in the diagnosis of choanal atresia in a patient that presented with bilateral choanal atresia, undiagnosed until about seven years.