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A 34-year-old seamstress was diagnosed with Parsonage-Turner brachial neuritis in the right upper extremity 1 month ago. She has weak forearm pronation with the elbow in the flexed position. She denies any current sensory changes. A clinical image of her hands attempting to make a clenched fist are shown in Figure A. Which of the following most likely represents her diagnosis and treatment?
Anterior interosseous nerve syndrome treated with observation
Posterior interosseous nerve syndrome with release of the Arcade of Frohse
Pronator syndrome with surgical release of the lacertus fibrosis
Anterior interosseous nerve syndrome with surgical release of Gantzer's muscle
Posterior interosseous nerve syndrome treated with observation
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