Spinocerebellar Ataxia, Autosomal Recessive 18, also known as autosomal recessive spinocerebellar ataxia 18, is related to autosomal dominant cerebellar ataxia and autosomal recessive cerebellar ataxia, and has symptoms including cerebellar ataxia, dysdiadochokinesis and ataxia, truncal. An important gene associated with Spinocerebellar Ataxia, Autosomal Recessive 18 is GRID2 (Glutamate Ionotropic Receptor Delta Type Subunit 2). Affiliated tissues include spinal cord and cerebellum, and related phenotypes are limb ataxia and truncal ataxia