ELOVL4 and erythrokeratodermia variabilis: Heterozygous inheritance of four different ELOVL4 mutations causes autosomal dominant spinocerebellar ataxia-34 (SCA34), a late-onset neurodegenerative disease of the cerebellum that results in a characteristic gait ataxia that may be accompanied by dysarthria and eye movement abnormalities, with or without erythrokeratitis variabilis (EKV), a disorder of the skin [28–30, 35].