Essential tremor: phenotypes.

Abstract excerpt

Classically, essential tremor (ET) was defined by the Movement Disorder Society Consensus Statement on Tremor (1998) as "a bilateral, largely symmetric postural or kinetic tremor involving hands and forearms that is visible and persistent". Additional or isolated tremor of the head may occur but in the absence of abnormal posture. Duration is more than 5 years and the neurological examination is normal, with...

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