Pseudoathetosis

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Pseudoathetosis is abnormal writhing movements, usually of the fingers, caused by a failure of joint position sense (proprioception). When the eyes are open, visual feedback can substitute for proprioception: therefore pseudoathetosis appears only when the eyes are closed, and disappears when they are opened. It is most commonly caused by peripheral neuropathy of the sensory type. Once cause - B12 deficiency.

It is frequently mistaken for athetosis or choreoathetosis. However, these abnormal movements occur when the eyes are both open and closed and have a different etiology. Athetosis is overdiagnosed owing to this similarity.

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