Polymyositis Differential Diagnoses

Updated: Dec 08, 2017
  • Author: Ramesh Pappu, MD, DPH, MBBS; Chief Editor: Herbert S Diamond, MD  more...
  • Print
DDx

Diagnostic Considerations

Conditions to consider in the differential diagnosis of polymyositis include the following:

  • Hypokalemia
  • Hypophosphatemia
  • Myasthenia gravis
  • Myopathies
  • Inclusion body myositis
  • Eosinophilic myositis
  • Myositis ossificans
  • Focal myositis
  • Giant cell myositis
  • Diabetic polyradiculopathy
  • Metabolic myopathy
  • Muscular dystrophy
  • Myasthenia gravis
  • Overlap connective-tissue diseases

Drug-induced myopathy may result from the following:

  • Alcohol
  • Antimalarials
  • Clofibrate
  • Colchicine
  • Ketoconazole and other azole antifungal agents
  • Statins
  • D-penicillamine
  • Vincristine
  • Zidovudine (AZT)

Differential Diagnoses