Treacher-Collins syndrome is characterized by malar hypoplasia, micrognathia, and external ear anomalies. Hypoplasia of the zygomatic bones and jaw can cause breathing and feeding difficulties. Around 40%-50% of individuals present decreased conductive hearing due to malformation of the ossicles and hypoplasia of the middle ear cavities. The structures of the inner ear are usually normal. Other less common anomalies are cleft palate and unilateral or bilateral choanal stenosis or atresia. Intellectual capacity is usually ordinary.
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