Introduction: Congenital Aural Atresia (CAA) or microtia is a malformation that results in esthetic and functional problems. There is little information on prevalence, considering that Latin American is the most affected region in the world.
Objective: To determine the prevalence of microtia, considering the different ethnical structure of the population.
Methods: A retrospective analysis was performed of the clinical reports of newborn infants (public hospitals) in three different regions.
Results: The incidence of CAA in Argentina was 1 case per 7500 new births (i.e. 1.3/10,000). Marked differences were found per geographical area. The means were calculated per year by bilateral parametric estimation, according to the ethnical origins of the population. In the Caucasoid area: 02.47/10,000 (±1.2), in the Mestizo area: 03.99/10,000 (±0.0) and finally in the Amerindian area: 20.93/10,000 (±0.1).
Conclusion: This study shows different incidences according to the demographic features of the population from 1.90/10,000 to 20.9/10,000. This data indicates that CAA is associated with a genetic problem (ethnic differences).
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