Treacher Collins syndrome is a condition that affects the development of bones and other tissues of the face. The signs and symptoms of this syndrome vary greatly, ranging from almost unnoticeable to severe. Most affected individuals have underdeveloped facial bones, particularly the cheek bones, and a very small jaw and chin. This condition is also characterized by absent, small, or unusually formed ears and half have hearing loss. This condition affects an estimated 1 in 50,000 people.
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