Wing-Beating Tremor in Wilson's Disease



It is a low-frequency, high-amplitude tremor, prominent when the patient's arms are held outstretched laterally or with the arms extended in front of the patient with the palms facing downward and the elbows flexed, the tremor increases in amplitude with increased duration of posture holding. 

The name comes from the fact that the movement of the patient's arms may be reminiscent of a bird's flapping wings.

The excessive facile grinning is also characteristically seen in Wilson's Disease.



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