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An inborn error of bile acid synthesis characterized by abnormally increased liver enzymes, hypolipidemia and low cholesterol, vitamin D deficiency, elevated plasma and urinary levels of C27 intermediate bile acids 3alpha,7alpha-dihydroxy-5beta-cholestanoic acid (DHCA) and 3alpha,7alpha,12alpha-trihydroxy-5beta-cholestanoic acid (THCA). Serum levels of phytanic and pristanic acids are normal. Clinical features include liver fibrosis, mild ataxia, delayed development, and cognitive impairment. Liver histology shows many thin fibrous septa, swollen hepatocytes, glycogenated nuclei, and focal acinar transformation, consistent with hepatocellular injury and regeneration, without signs of obvious cholestasis, cholate stasis, or steatosis. CBAS6 transmission pattern is consistent with autosomal recessive inheritance.