男性，62岁，近3周周身肌肉酸痛，双上肢 抬举、蹲起费力，低热。查体:皮肤无皮疹，四肢 肌力IV级，肌肉无压痛。辅助检查提示：ESR 52mm/h,CRP 60mg/L，肌酶及肌电图正常。该患者最可能的疾病是

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