Snijders Blok-Campeau Syndrome, also known as intellectual developmental disorder with macrocephaly, speech delay, and dysmorphic facies, is related to cerebellar atrophy, developmental delay, and seizures and autism spectrum disorder. An important gene associated with Snijders Blok-Campeau Syndrome is CHD3 (Chromodomain Helicase DNA Binding Protein 3). Affiliated tissues include heart and tongue, and related phenotypes are intellectual disability and global developmental delay