皮肌炎系少见而严重的自身免疫性疾病，以皮肤及横纹肌非化脓性炎症、肌酸尿为特征。早期可有吞咽、发音、呼吸功能障碍等咽、喉、呼吸肌受累的表现。近年似呈增加趋势。约6％～52％伴发恶性肿瘤，其中国内鼻咽癌占50％～70％，故日益受到耳鼻咽喉科医师重视。笔者9年中曾遇3例 Dermatomyositis is a rare and severe autoimmune disease characterized by non-suppurative inflammation of the skin and striated muscle and creatinine. Early may have swallowing, pronunciation, respiratory dysfunction, throat, throat, respiratory muscle involvement performance. In recent years, it seems to be increasing. About 6% to 52% with malignant tumors, of which 50% to 70% of NPC in China, it is increasingly valued by otolaryngologists. I encountered three cases in 9 years