A 72-Year-Old Man Is Brought to the Emergency Department Due

A 72-year-old man is brought to the emergency department due to involuntary movements of his right arm that started several hours ago.  He was watching television when his arm "threw the remote control across the room."  His past medical history is significant for long-standing hypertension and diabetes mellitus.  The patient does not use alcohol, tobacco, or illicit drugs.  Physical examination shows wild, large-amplitude, flinging movements affecting the proximal muscles of his right arm.  Which of the following areas of the brain is most likely injured in this patient?

A) Caudate nucleus
B) Internal capsule
C) Lentiform nucleus
D) Substantia nigra
E) Subthalamic nucleus
F) Ventral posterior thalamus

Correct Answer:

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