Niemann-Pick type C (NP-C) disease is a neurovisceral atypical lysosomal lipid storage disorder with a poor prognosis. We present the 5-year neuropsychological follow-up of a patient with juvenile onset NP-C, spanning the pre-diagnostic stage to the period after treatment with miglustat (Actelion Pharmaceuticals Inc., CA, US). In the initial stages of the disease, the patient presented behavioral dysexecutive symptoms resembling those frequently observed in adult-onset forms and frontotemporal dementia, which frequently makes early diagnosis difficult in children. After 4 years of treatment, the impaired cognitive function and behavioral dysexecutive syndrome had been completely reversed. The variability of NP-C disease makes early diagnosis challenging. Evaluations of long-term neuropsychological development can help diagnose this neurodegenerative disease and document its progression.
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