Megalocornea-intellectual disability syndrome is a rare intellectual disability syndrome most commonly characterized by megalocornea, congenital hypotonia, varying degrees of intellectual disability, psychomotor/developmental delay, seizures, and mild facial dysmorphism (including round face, frontal bossing, antimongoloid slant of the eyes, epicanthal folds, large low set ears, broad nasal base, anteverted nostrils, and long upper lip). Interfamilial and intrafamilial clinical variability has been reported. The disease is Monarch Disease Ontology term MONDO_0009577 (megalocornea-intellectual disability syndrome). Also known as: MMR syndrome, Megalocornea Intellectual Disability Syndrome, NeuhC$user syndrome, Neuhäuser syndrome.