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Hemifacial Spasms on Physical Exam Unilateral clonic jerks with synchronous tonic spasms of all facial muscles: Hemifacial Spasms. Twitching can be brought about or increased by voluntary facial muscle contraction. Dr. Reenu Choudhary @reenu_drneuro #Hemifacial #Spasms #PhysicalExam #clinical #video #neurology