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Question: What is the frequency of developing late-onset giant cell arteritis in patients initially diagnosed with isolated polymyalgia rheumatica?
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Correct Answer: C. In a prospective cohort study of 62 patients with polymyalgia rheumatica, 3 percent of patients had radiologic evidence of subclinical giant cell arteritis at baseline, and another 3 percent subsequently developed late-onset giant cell arteritis during the following year.
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