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多发性肌炎与皮肌炎均为自身免疫性结缔组织疾病。该类疾病表现有3种形式:①原发性多肌炎,不与其它结缔组织疾病并发,属于肌器官的特殊性自身免疫疾病;②合并其它结缔组织疾病的多肌炎或皮肌炎,多为系统性的自身免疫疾病;③并发于癌肿的多肌炎或皮肌炎,约占10～30%。
Polymyositis and dermatomyositis are autoimmune connective tissue diseases. The manifestations of such diseases have three forms: ① polymyositis, not with other connective tissue disease complicated by a particular autoimmune disease of the musculature; ② polymyositis or dermatomyositis combined with other connective tissue diseases, Mostly systemic autoimmune diseases; ③ complicated by cancer of the polymyositis or dermatomyositis, accounting for about 10 to 30%.