A 20-Year-Old Man Is Evaluated in the Clinic for Right

A 20-year-old man is evaluated in the clinic for right arm weakness and numbness.  He is a competitive baseball pitcher and says that he played a lot more innings than usual last week because his team made the playoffs.  Since then, the patient has had difficulty using the right arm, particularly when lifting objects.  He has no known history of head, neck, or upper extremity trauma.  On physical examination, there is diminished strength on right elbow flexion and an absent biceps reflex.  This patient is most likely to have sensory loss over which of the following areas?

A) Lateral forearm
B) Medial forearm
C) Posterior arm
D) Posterior forearm
E) Thenar eminence

Correct Answer:

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