X-linked form of Opitz G/BBB syndrome. The disease is X-linked Opitz G/BBB syndrome (MONDO_0010222, a Monarch Disease Ontology id). Also known as: Opitz G/BBB syndrome, X-linked, Opitz GBBB syndrome, type I, X-linked recessive, X-linked Opitz BBB/G syndrome, X-linked Opitz syndrome, XLOS.