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Primary dystonia

Definition:

Dystonias are a heterogeneous group of hyperkinetic movement disorders characterized by involuntary sustained muscle contractions that lead to abnormal postures and repetitive movements. Presently, 30 distinct monogenic primary dystonias have been recognized. They can be divided into Primary torsion dystonias (PTDs), dystonia-plus syndromes without brain degeneration, dystonia-parkinsonism with brain degeneration (i.e. DYT3), and paroxysmal dyskinesias.

References:

Biomedical Dictionary

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