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Pseudoathetosis is a movement disorder in which there is abnormal writhing movements, usually of the fingers, caused by a failure of joint position sense (proprioception) and indicates disruption of the proprioceptive pathway, from nerve to parietal cortex.
Analogous to Romberg's sign, the abnormal posturing is most pronounced when the eyes are closed as visual inputs are unavailable to guide corrective movements. Paradoxically, eye closure may decrease the amount of movement as the visual cues probably trigger corrective movements which return the limb to the desired "baseline" allowing a new phase of involuntary drift before a subsequent corrective phase occurs.
Hemipseudaoathetosis refers to pseudoathetosis on one side of the body, usually the upper limb and is most commonly caused by a lesion affecting the cuneate tract or cuneate nucleus in the cervical spine or lower brainstem (medulla) respectively.
- ↑ Spitz M, Costa Machado AA, Carvalho Rdo C, et al. (2006). Pseudoathetosis: report of three patients. Mov. Disord. 21 (9): 1520–2.
- ↑ Gotkine M, Gomori JM (2007). Hemipseudoathetosis due to a hemorrhage at the cervicomedullary junction. Neurology 69 (15): 1551.
- ↑ Ghika J, Bogousslavsky J (1997). Spinal pseudoathetosis: a rare, forgotten syndrome, with a review of old and recent descriptions. Neurology 49 (2): 432–7.
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