Teenager with lethary, lower limb aches and pains. High clinical suspicion of dermatomyositis.
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Diffuse high T2 signal throughout the musculature of both upper limbs and visualised pelvis.
No muscle group is spared.
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.