Assessment of active inflammation in juvenile dermatomyositis: a novel magnetic resonance imaging-based scoring system.

Objective: To assess the reproducibility of a novel scoring system that we have developed for the objective assessment of acute inflammatory change in JDM. This system defines markers of inflammatory change in four muscle groups and the surrounding soft tissues.

Methods: Forty-eight children (33 girls) underwent retrospective assessment of their MRI studies by two musculoskeletal paediatric radiologists for the presence of disease activity.