Spastic Tetraplegia, Thin Corpus Callosum, and Progressive Microcephaly, also known as spastic tetraplegia-thin corpus callosum-progressive postnatal microcephaly syndrome, is related to microcephaly and quadriplegia. An important gene associated with Spastic Tetraplegia, Thin Corpus Callosum, and Progressive Microcephaly is SLC1A4 (Solute Carrier Family 1 Member 4). Affiliated tissues include brain, and related phenotypes are intellectual disability and hyperreflexia