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Desmosterolosis is an autosomal recessive disorder of cholesterol biosynthesis caused by biallelic mutations of  DHCR24  (homozygous or compound heterozygous), which encodes 3-β-hydroxysterol Δ-24-reductase. We report two sisters homozygous for the 571G>A (E191K)  DHCR24  mutation. Comparison of the propositae to other reported individuals shows that psychomotor developmental delay, failure to thrive, dysgenesis of the corpus callosum, cerebral white matter atrophy and spasticity likely constitute the minimal desmosterolosis phenotype. The nonspecific features of desmosterolosis make it difficult to suspect clinically and therefore screening for it should be entertained early in the diagnostic evaluation.

Desmosterolosis: an illustration of diagnostic ambiguity of cholesterol synthesis disorders