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Volume 347:295 July 25, 2002 Number 4
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Reversible Chorea and Focal Dystonia in Vitamin B12 Deficiency

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To the Editor: A 71-year-old man presented in June 2000 with a two-month history of progressive right hemichorea. His medical history included a resection for gastric cancer at the age of 55 years. Neurologic examination revealed a postural, symmetric, rapid tremor of the hands; choreic movements of the right upper limb and right toes; and moderate hypopallesthesia in the four limbs. The results of laboratory tests showed a macrocytic anemia: erythrocytes, 4.15x106 per microliter (normal range, 4.7 to 6.1); mean corpuscular volume, 102.4 fl (normal range, 80 to 94); a normal hemoglobin level; and vitamin B12, 124 . . . [Full Text of this Article]



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