A 67-year-old woman has new bilateral shoulder and hip girdle aching with difficulty lifting her arms and rising from a chair. Symptoms are worst in the morning for 90 minutes, she has no objective muscle weakness, and her creatine kinase is normal. Her C-reactive protein is 74 mg/L (reference range less than 5), with normal calcium and thyroid function. Which is the most likely diagnosis?
Keep going — a set of ten like this one, one at a time.
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