disease shares features of pervasive developmental disorder Rett syndrome monogenic epilepsy obsolete motor stereotypies atypical Rett syndrome https://github.com/monarch-initiative/mondo/issues/3680 UMLS:C2748910 Orphanet:3095 SCTID:718393002 Rett syndrome variant Rett like syndrome NANDO:1200605 GARD:0004694 MEDGEN:440664 icd11.foundation:605088126 atypical RTT MONDO:0017746 A neurodevelopmental disorder that is diagnosed when a child presents with a Rett-like syndrome but does not fulfill all the diagnostic criteria for typical Rett syndrome (classic/typical RTT). X-linked syndromic intellectual disability neurodevelopmental disorder