Myositis (peds)

Background

• Influenza is one of the most common causes of viral myositis
• Rhabdo is unusual but has been reported.

Clinical Features

• Patients usually have a history of recent illness (fever, URI symptoms, fever, etc)
• Significant myalgias as starting to improve from constitutional symptoms
  • Most commonly lower legs
  • Can have pain and tenderness in other muscle groups (thighs, arms)
• Usually look well, but will sometimes walk with wide gait and on their toes
  • When lying in bed, will often keep toes pointed with pain in calves upon dorsiflexion

Evaluation

Workup

• Total ck
• UA (for myoglobin)