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Congenital unilateral hypoplasia of depressor anguli oris
Asymmetry observed in the face of a neonate or infant whose face appears symmetric at rest and asymmetric during crying as the mouth is pulled downward on one side while not moving on the other side. [from HPO]
Treacher Collins syndrome
Treacher Collins syndrome (TCS) is characterized by bilateral and symmetric downslanting palpebral fissures, malar hypoplasia, micrognathia, and external ear abnormalities. Hypoplasia of the zygomatic bones and mandible can cause significant feeding and respiratory difficulties. About 40%-50% of individuals have conductive hearing loss attributed most commonly to malformation of the ossicles and hypoplasia of the middle ear cavities. Inner ear structures tend to be normal. Other, less common abnormalities include cleft palate and unilateral or bilateral choanal stenosis or atresia. Typically intellect is normal. [from GeneReviews]
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