Rare Syndromic Intellectual Disability is related to rare syndromic intellectual disability without multiple congenital anomalies/dysmorphic syndrome and cerebellar vermis aplasia with associated features suggesting smith-lemli-opitz syndrome and meckel syndrome. An important gene associated with Rare Syndromic Intellectual Disability is ATXN7L3-AS1 (ATXN7L3 Antisense RNA 1).