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A 62-year-old man has a sudden onset of involuntary swinging movements of his right arm. An ischemic injury to which of the following structures would most likely explain this sign?

  A
  B: I'm sorry, that's not correct. This is the posterior limb of the internal capsule which contains the corticospinal, corticobulbar, and corticopontine tracts. A lesion here would lead to contralateral motor loss and/or contralateral cerebellar signs, but not the dramatic involuntary movements described in the question.
  C
  D
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