TF and Ataxia: Based on the initial clinical assumption of an autosomal-recessive ataxia, the index patient was assessed by extensive serum testing for biomarkers indicative of recessive ataxias (alpha-feto protein, lactate, vitamin E, very long chain fatty acids, phytanic acid, coeruloplasmin, cholesteanol, lysosomal enzymes, carbohydrate-deficient transferrin, quantitative assessment of amino acids) [15], and genetic testing of FRDA, POLG, PEO1/Twinkle, WFS1, and ABHD12. All results were normal.