This week’s edition of the Step 1 Question of the Week is about high-yield anatomy. See if you can answer the question and then watch the video to learn the correct answer as well as the rationales for each option.
A 10-year-old boy is brought to the pediatrician with a 4-day history of fever, fatigue, and right shoulder pain. His temperature is 38.6°C (101.5°F). On physical examination, he has right shoulder tenderness, worse at the right axillary region, and painful and weak abduction. On palpation, a swollen mass in the axillary region is noted. He also has wrist-extension weakness and triceps hyporeflexia in the same limb. Sensory examination reveals absent sensation to light touch over the right shoulder and lateral and posterior arm. Imaging identifies an abscess in the right axillary region. The most likely diagnosis is an abscess.
Which of the following structures is most likely being compressed by the abscess?
A. Axillary nerve
B. Lateral cord of the brachial plexus
C. Medial cord of the brachial plexus
D. Posterior cord of brachial plexus
E. Radial nerve
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