TPP1 and Parkinson disease: Movement disorders, such as myoclonus, ataxia, dystonia, parkinsonism, and chorea, are frequent in patients with NCLs57and have been described in patients with CLN2.16, 58According to our experts, the drug used for myoclonus is levetiracetam and for parkinsonism is dopamine; trihexyphenidyl and biperiden are indicated for dystonia with no preference among them (consensus; LE: 5).