What is the prognosis of polymyositis?

Updated: Jan 05, 2021
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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In most patients, polymyositis responds well to treatment, although residual weakness occurs in approximately 30% of patients. Osteoporosis, a common complication of long-term corticosteroid therapy, may cause significant morbidity. A study from Taiwan determined that the risk of osteoporosis was 2.99 times higher in patients with polymyositis, and that the risk was independent of corticosteroid and immunosuppressant treatment. [10]

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