Arrhinia-Choanal Atresia-Microphthalmia Syndrome, also known as arrhinia with choanal atresia and microphthalmia syndrome, is related to bosma arhinia microphthalmia syndrome. An important gene associated with Arrhinia-Choanal Atresia-Microphthalmia Syndrome is SMCHD1 (Structural Maintenance Of Chromosomes Flexible Hinge Domain Containing 1). Related phenotypes are microphthalmia and midface retrusion