Intellectual Developmental Disorder, Autosomal Recessive 18, with or Without Epilepsy, is also known as intellectual developmental disorder, autosomal recessive 18. An important gene associated with Intellectual Developmental Disorder, Autosomal Recessive 18, with or Without Epilepsy is MED23 (Mediator Complex Subunit 23). Affiliated tissues include brain and heart, and related phenotypes are intellectual disability and spasticity