8p23.1 deletion involves a partial deletion of the short arm of chromosome 8 characterized by low birth weight, postnatal growth deficiency, mild intellectual deficit, hyperactivity, craniofacial abnormalities, and congenital heart defects. The disease is MONDO_0016658 (8p23.1 microdeletion syndrome). Also known as: Del(8)(p23.1), monosomy 8p23.1.