Rheumatology Book

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Polymyositis Differential Diagnosis

Aka: Polymyositis Differential Diagnosis, Dermatomyositis Differential Diagnosis, Myopathy Causes, Muscle Weakness Causes
  1. See Also
    1. Polymyositis
    2. Dermatomyositis
  2. Differential Diagnosis: Cutaneous (Dermatomyositis)
    1. HIV Infection (once Immunodeficiency occurs)
    2. Lichen Planus
    3. Polymorphous light eruption
    4. Seborrheic Dermatitis
    5. Systemic Lupus Erythematosus
    6. Psoriasis
    7. Contact Dermatitis
    8. Atopic Dermatitis
    9. Trichinosis
    10. Alcohol
  3. Differential Diagnosis: Neuromuscular Disorders
    1. Genetic Muscular Dystrophies
    2. Spinal Muscular Atrophy
    3. Myasthenia Gravis
    4. Eaton Lambert Syndrome
    5. Amyotrophic Lateral Sclerosis
    6. Myotonia
    7. Organophosphate Poisoning
    8. See Neuropathy
      1. Guillain-Barre (other autoimmune polyneuropathies)
      2. Multiple Sclerosis
      3. Diabetes Mellitus
      4. Porphyria
  4. Differential Diagnosis: Endocrine and Metabolic Disorders
    1. Electrolyte
      1. Hypokalemia
      2. Hypocalcemia
      3. Hypomagnesemia
    2. Hypothyroidism
    3. Hyperthyroidism
    4. Hypoparathyroidism
    5. Hyperparathyroidism
    6. Cushing's Syndrome
    7. Addison's Disease
    8. McArdle's disease (Glycogen Phosphorylase Deficiency)
    9. Adult acid maltase deficiency
    10. Carnitine-palmitoyltransferase deficiency
    11. Periodic paralysis
  5. Differential Diagnosis: Toxic Myopathy
    1. See Medication Causes of Myositis
    2. Steroid Myopathy
    3. Alcoholic Myopathy
  6. Differential Diagnosis: Infections
    1. Viral
      1. Influenza
      2. Epstein Barr Virus
      3. Coxsackievirus
      4. Rubella
      5. Human Immunodeficiency Virus (HIV)
      6. Polio
      7. Rabies
    2. Bacterial
      1. Staphylococcus
      2. Streptococcus
      3. Clostridium
      4. SalmonellaTyphus
      5. Mycobacterium leprae
      6. Lyme Disease
      7. Syphilis
    3. Parasitic
      1. Toxoplasmosis
      2. Trichinella
      3. Schistosomiasis
      4. Cysticercosis
  7. Differential Diagnosis: Miscellaneous
    1. Polymyalgia Rheumatica
    2. Acute Rhabdomyolysis
    3. Systemic Sclerosis
    4. Amyloidosis
    5. Sarcoidosis
  8. References
    1. Euwer (1994) Curr Opin Rheumatol 6:583-9 [PubMed]
    2. Koler (2001) Am Fam Physician 64(9):1565-72 [PubMed]
    3. Pachman (1995) Pediatr Clin North Am 42:1071-98 [PubMed]

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