syndromic intellectual disability syndromic disease obsolete ARX-related epileptic encephalopathy infantile spasms https://github.com/monarch-initiative/mondo/issues/5588 https://github.com/monarch-initiative/mondo/issues/7969 https://www.epilepsydiagnosis.org/syndrome/west-syndrome-overview.html https://www.malacards.org/card/infantile_epileptic_spasms_syndrome https://www.malacards.org/card/west_syndrome intellectual disability-hypsarrhythmia syndrome Orphanet:3451 MEDGEN:11519 ICD9:345.60 NCIT:C84788 Orphanet:697160 IESS GARD:0007887 MONDO:0018097 infantile spasms syndrome infantile epileptic spasms syndrome infantile spasms NORD:1848 NANDO:1200592 West syndrome X-linked infantile spasms icd11.foundation:1023597213 A rare epilepsy syndrome characterized by onset of epileptic spasms in infants between 2 and 12 months of age, and rarely up to 24 months. Infants may have no antecedent history, or a history reflecting the underlying cause. The classical triad of epileptic spasms, hypsarrhythmia and developmental stagnation or regression is historically referred to as West syndrome. X-linked infantile spasm syndrome NANDO:2200878 ICD9:348.89 UMLS:C0037769 tonic spasms with clustering, arrest of psychomotor development and hypsarrhythmia on EEG West's syndrome MedDRA:10021750 SCTID:28055006 DOID:0050562 neonatal/infantile-onset epilepsy syndrome with developmental and epileptic encephalopathy