CASK-related intellectual disability X-linked intellectual disability with or without nystagmus https://github.com/monarch-initiative/mondo/issues/9747 MEDGEN:476987 UMLS:C3275356 An X-linked intelelctual disability in which the cause of the disease is hypomorphic CASK pathogenic variants. Affected individuals present with intellectual disability with or without congenital nystagmus. Additional features often include epilepsy, speech impairment, motor delay, and variable brain malformations. Phenotypic severity ranges from mild cognitive impairment to severe developmental disability. MONDO:1060193 XLID