Monarch Disease Ontology id MONDO_0010319 (syndromic X-linked intellectual disability Hedera type) can be described as follows. X-linked intellectual disability, Hedera type is a rare X-linked intellectual disability syndrome characterized by an onset in infancy of delayed motor and speech milestones, generalized tonic-clonic seizures and drop attacks, and mild to moderate intellectual disability. Additional, less common manifestations include scoliosis, ataxia (resulting in progressive gait disturbance), and bilateral pes planovalgus. Physical appearance is normal with no dysmorphic features reported. Also known as: MRXE, MRXSH, X-linked intellectual disability with epilepsy, X-linked mental retardation with epilepsy, intellectual developmental disorder, X-linked, syndromic, Hedera type, X-linked recessive, intellectual disability, X-linked, syndromic, Hedera type, mental retardation, X-linked, syndromic, Hedera type.