pervasive developmental disorder syndromic disease Rett syndrome https://github.com/monarch-initiative/mondo/issues/3680 https://github.com/monarch-initiative/mondo/issues/4521 https://www.malacards.org/card/rett_syndrome Orphanet:778 NANDO:2200825 NANDO:2100219 icd11.foundation:201200685 NORD:1666 SCTID:68618008 MedDRA:10039000 RTT RTS Rett’s disease NCIT:C75488 MEDGEN:48441 MONDO:0010726 DOID:1206 GARD:0005696 A severe neurodevelopmental disorder affecting the central nervous system. Rett syndrome, preserved speech variant, X-linked dominant UMLS:C0035372 Rett syndrome, atypical, X-linked dominant MESH:D015518 Rett syndrome ICD9:330.8 Rett syndrome, X-linked dominant OMIM:312750 NANDO:1200603 NANDO:1200604 monogenic epilepsy obsolete motor stereotypies X-linked syndromic intellectual disability Mendelian neurodevelopmental disorder obsolete_Rett syndrome