G Ge, X Z Chang, T Y Ji, H Xiong, Y Wu, X H Bao, Y H Zhang, Y H Zhang, J Zhang, Y Wu, H Dong, C J Wei
There are differences between the 2 major juvenile IIM subtypes in terms of clinical manifestations, muscle MRI findings, and muscle pathological features. Dermatomyositis is more likely to present with characteristic skin rashes and perifascicular muscle fiber pathological changes, whereas IMNM is characterized by markedly elevated serum CK levels and prominent muscle fiber necrosis, and is more frequently associated with muscle fatty infiltration.