from Section I - General Principles and a Phenomenology-Based Approach to Movement Disorders and Inherited Metabolic Disorders
Published online by Cambridge University Press: 24 September 2020
Historically, childhood-onset, isolated, generalized, and inherited forms of dystonia (such as DYT1 dystonia) and adult-onset, isolated, focal, mainly idiopathic dystonias have been emphasized. There is, however, growing awareness of neurometabolic disorders being etiological for both childhood-onset and adult-onset dystonia. The dystonia syndromes associated with inborn errors of metabolism (IEMs) usually have an early and (sub-) acute onset, progressive course, and generalized distribution [1]. In general, patients with an IEM do not present with isolated dystonia, but have additional neurological and non-neurological symptoms. This combined or mixed presentation of dystonia and other symptoms may suggest an IEM as the underlying cause. Recognition of dystonia as a clinical feature of a given IEM is essential for diagnostic and targeted treatment strategies, because IEMs include a group of treatable disorders. In addition, symptomatic treatment of dystonia is important as movement disorders negatively impact on the quality of life and daily functioning in patients with an IEM [2].
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