CholestanolXanthomatosis, CerebrotendinousXanthomatosisCholestanolsSitosterolsCholestanesSterolsJejunoileal BypassCholestanetriol 26-MonooxygenaseCholestenonesPhytosterolsCholesterolCholestyramine ResinDesmosterolBile Acids and SaltsBiliary FistulaSqualeneCholesterol 7-alpha-HydroxylaseSteroid HydroxylasesCholestenesBrain Diseases, MetabolicBrain DiseasesTendonsCarbon RadioisotopesChromatography, GasCholestenone 5 alpha-ReductaseCholic AcidEstersGas Chromatography-Mass SpectrometryLipid Metabolism, Inborn ErrorsHydroxycholesterols