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多发性肌炎是一种原因不明的炎症性肌病,当出现特征性的皮疹时则名为皮肌炎,两者均有结缔组织疾病的共同特点,故常被归类在一起。据报道与肿瘤并发的机会已增多。
Polymyositis is an unexplained inflammatory myopathy that is called dermatomyositis when it occurs, and both have common features of connective tissue disease and are often grouped together. It has been reported that the chance of concomitant tumors has increased.