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Auriculo-condylar syndrome (ACS) presents with bilateral external ear malformations ('question mark' ears), mandibular condyle hypoplasia, microstomia, micrognathia, microglossia and facial asymmetry. Additional manifestations include hypotonia, ptosis, cleft palate, puffy cheeks, developmental delay, impaired hearing and respiratory distress.
So far, ACS has been reported in six multigenerational families.
This condition can be classified as a disease of the first and second embryonic pharyngeal arches and is characterized by significant intra- and interfamilial phenotypic variation.
It is transmitted in an autosomal dominant manner.