(BMJ)—A 58-yo woman w/ hx of RA presented w/ a sudden inability to use her R thumb after trying to tear open a dishwasher tablet package. Exam: R thumb in dropped position. Able to abduct, adduct, oppose, and flex but not extend. Her hand was neurovascularly intact. What is the dx?
Radial nerve palsy
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Extensor pollicis longus rupture
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Posterior interosseous nerve injury
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Adductor pollicis longus rupture
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De Quervain tenosynovitis
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