Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2001
Segmental myoclonus in a patient affected by syringomyelia.
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Bagnato S, Rizzo V, Quartarone A, Majorana G, Vita G, Girlanda P
Аннотация
We describe a patient who has been complaining of brief jerk-like, rhythmic, involuntary movements involving the second digit of the left hand for the last three months. These involuntary jerks produced an adduction movement of the second digit and were unaffected by peripheral sensory stimuli. In addition, the patient experienced loss of dexterity in the left hand. On examination the patient showed hypotrophy of the first dorsal interosseous (FDI) muscle of the left hand and a dissociated sensory loss involving the C8-T1 dermatomes. Magnetic resonance imaging of the brain and spinal cord revealed a tonsilar hemiation characteristic of the Chiari I malformation associated with a syrinx extending from C4 to D5 that did not communicate with the fourth ventricle. The electrophysiological evaluation indicated the presence of a focal myoclonus of spinal origin that is likely to be caused by the syrinx.