1. A 9-year-old boy presents for evaluation of abnormal involuntary movements.
His mother reports that he started developing odd movements in his arms
and face 1 week ago and also became irritable and anxious. He had a sore throat
and fever 4 weeks ago and was treated with over-the-counter supplements.
No family history exists of any neurologic disorder. On examination, he is afebrile
with frequent choreiform movements in his limbs and face. The reminder of
the neurologic examination is normal. What is the most likely diagnosis?
A. diphtheria
B. Huntington disease
C. N-methyl-D-aspartate (NMDA) receptor encephalitis
D. subcortical cerebral infarct
E . Sydenham chore
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