Pediatric Dermatomyositis

  • Etiology: autoimmune inflammatory myositis
  • MRI: diffuse T2 hyperintensity in proximal muscles without atrophy, anterior compartment dominant (vastus lateralis / intermedialis)
  • Clinical: puritic rash on exposed skin, especially extensor surfaces (heliotrope rash)

Radiology Cases of Dermatomyositis

MRI of dermatomyositis
Axial T2 (upper left) and coronal STIR (upper right) MRI without contrast of the pelvis show increased signal intensity in all of the muscles in the pelvis and thighs while the coronal T1 without contrast (lower left) and coronal T1 with contrast (lower right) MRI of the pelvis show enhancement in all of the muscles in the pelvis and thighs.