The Authors describe two monochorionic twins affected by Niemann-Pick disease type C with a clinical picture beginning in the neonatal age and with a progressive mental deterioration, loss of speech and spasticity started at 30 months. The importance of cultured skin fibroblasts is emphasized. The evidence of a defective intracellular cholesterol esterification is established as an intrinsic feature of Niemann-Pick disease type C.
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