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Inflammatory Myopathy (Idiopathic Inflammatory Myopathies)

Group of autoimmune muscle diseases causing progressive muscle weakness.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Nöroloji department. Book Appointment →

What is Inflammatory Myopathy (Idiopathic Inflammatory Myopathies)?

Idiopathic inflammatory myopathies (IIM) are a heterogeneous group of autoimmune muscle diseases. The main subtypes: dermatomyositis (DM), polymyositis (PM), inclusion body myositis (IBM), immune-mediated necrotising myopathy (IMNM), antisynthetase syndrome and overlap myositis. Each has different histopathology, antibodies and clinical findings.

Common clinical features: symmetrical proximal muscle weakness (difficulty climbing stairs, getting up from chair, lifting head from pillow), muscle enzyme (CK) elevation, dysphagia. DM-specific findings: heliotrope rash, Gottron papules/sign, shawl sign, V sign, mechanic's hands. IBM-specific: asymmetrical, slow progression, finger flexor and quadriceps weakness, dysphagia, often >50 years.

Diagnosis: clinical + EMG + muscle biopsy + myositis-specific autoantibodies (MSA: Jo-1, Mi-2, NXP2, TIF1-γ, MDA5, SRP, HMGCR) + MRI. Treatment: corticosteroids (1 mg/kg prednisolone, taper), steroid-sparing immunosuppression (methotrexate, azathioprine), IVIG, rituximab, JAK inhibitors. IBM is treatment-resistant, supportive care and physiotherapy. Cancer screening (especially DM) is critical.

Symptoms

Symmetrical proximal muscle weakness
Difficulty climbing stairs and getting up
Difficulty raising head and combing hair
Dysphagia (oropharyngeal)
Muscle pain (can be absent)
Heliotrope rash (eyelid, DM)
Gottron papules (knuckles, DM)
Mechanic's hands (cracked, anti-synthetase)
Calcinosis cutis (juvenile DM)
Raynaud's phenomenon
Interstitial lung disease (anti-MDA5)
Constitutional symptoms (fatigue, weight loss)

Risk Factors

Female gender (DM, PM)
Mean age 30-50 (DM, PM); >50 (IBM)
Cancer risk (DM > PM, especially TIF1-γ, NXP2 antibodies)
Family autoimmune disease history
Drug-induced (statin → HMGCR antibody)
Viral infection (preceding)
Genetic predisposition (HLA-DR3, DR52)
Other connective tissue diseases (overlap)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Newly developed proximal weakness
  • Difficulty getting up from chair, climbing stairs
  • Dysphagia
  • Skin rashes + muscle weakness
  • Severe muscle pain + dark urine (rhabdomyolysis)
  • Persistent fatigue
  • Newly developed dyspnoea (interstitial lung disease)
  • Significant weight loss

Treatment Methods

01
Detailed neurological examination + MRC muscle strength
02
Creatine kinase (CK), aldolase
03
Myositis-specific autoantibody panel
04
EMG (myopathic pattern, fibrillation)
05
Muscle MRI (oedema, atrophy)
06
Muscle biopsy (gold standard)
07
Cancer screening (PET-CT, age-appropriate)
08
High-dose IV methylprednisolone or oral prednisolone (1 mg/kg)
09
Methotrexate, azathioprine (steroid-sparing)
10
IVIG (DM, IMNM, refractory cases)
11
Rituximab (resistant cases)
12
JAK inhibitors (anti-MDA5, refractory)
13
Mycophenolate (interstitial lung disease)
14
Physiotherapy and rehabilitation
15
Dysphagia rehabilitation
16
ILD follow-up (pulmonology)

Which Department to Visit?

You can visit our Nöroloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.