Juvenile dermatomyositis


Juvenile dermatomyositis is a autoimmune inflammatory conditions involving muscles.

The juvenile form has a tendancy to be more severe and is less associated with an underlying malignancy than the adult form.

Auto-antibodies are relatively specific for the condition -- the specific elevated muscle specific antibodies being anti-RNa and anti-Mi2.

This case has the characteristic findings of diffuse high signal throughout affected muscles on T2/TIRM sequences.