The OAFNS phenotype combines abnormalities of the morphogenesis of the first and second branchial arches (microtia/skin tags, epibulbar dermoids, cleft lip/palate, mandibular hypoplasia, and facial asymmetry) with malformations due to the anomalous development of the frontonasal eminence and maxillary processes (notched/bifid nasal tip, cleft lip and/or palate, and encephalocele) (Gabbett et al., 2008). [from
OMIM]