Inflammatory Arthritis and Vitiligo

 

🩺 Internal Medicine Clinical Quiz

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📋 History

• 40-year-old female
• Pain and swelling in both hands
• Depigmented patches on forearms

🩺 Examination

• Tender MCP joints
• Swollen MCP joints
• Tender PIP joints
• Swollen PIP joints
• Positive Tinel's sign at wrist

🔬 Investigations

• CBC
• ESR, CRP
• Rheumatoid Factor (RF)
• Anti-CCP antibody
• X-ray hands and wrists
• ANA if clinically indicated

❓ MCQ Question

What is the most likely diagnosis?

A) Systemic Lupus Erythematosus and Melasma

B) Rheumatoid Arthritis and Vitiligo

C) Osteoarthritis and Pityriasis Versicolor

D) Psoriatic Arthritis and Vitiligo

📝 Brief Case Summary

A middle-aged woman presents with symmetrical inflammatory arthritis involving MCP and PIP joints along with depigmented skin lesions and features of median nerve compression.

✅ Clickable Answer

Click to Reveal Answer

✔️ B) Rheumatoid Arthritis and Vitiligo

📖 Answer Explanation

Symmetrical involvement of MCP and PIP joints is classic for Rheumatoid Arthritis (RA). Positive Tinel's sign suggests carpal tunnel syndrome, a common complication of RA. Depigmented patches are characteristic of vitiligo, an autoimmune disorder frequently associated with other autoimmune diseases.

❌ Why Not Others?

• A: Melasma causes hyperpigmentation, not depigmentation.
• C: Osteoarthritis commonly affects DIP joints and lacks marked inflammatory swelling.
• D: Psoriatic arthritis usually presents with psoriasis, dactylitis and nail pitting.

📚 Five Brief Case Scenarios

1. MCP + PIP arthritis with morning stiffness → RA.
2. DIP osteophytes in elderly woman → OA.
3. Malar rash with arthritis → SLE.
4. Dactylitis and nail pitting → Psoriatic arthritis.
5. Dry eyes and dry mouth → Sjögren syndrome.

🧬 Pathophysiology Simplified

Autoimmune activation causes synovial inflammation. Persistent inflammation forms pannus leading to cartilage destruction and bone erosion. Vitiligo results from autoimmune destruction of melanocytes.

🩺 Physical Examination Pearls

• Assess MCP squeeze tenderness.
• Look for prolonged morning stiffness.
• Check for ulnar deviation.
• Search for rheumatoid nodules.
• Evaluate carpal tunnel signs.

🔍 Investigations Choosing Wisely

• Anti-CCP is highly specific for RA.
• RF supports diagnosis.
• ESR and CRP assess activity.
• Ultrasound detects early synovitis.
• X-rays identify erosive disease.

💊 Management

• Methotrexate + folic acid
• NSAIDs for symptom control
• Short-term corticosteroids
• Biologic DMARDs if needed
• Physical therapy
• Management of carpal tunnel syndrome
• Dermatology referral for vitiligo

🔄 Differential Diagnosis

• Psoriatic arthritis
• SLE
• Sjögren syndrome
• Viral arthritis
• Osteoarthritis

⚠️ Clinical Pitfalls

• Misdiagnosing inflammatory arthritis as OA.
• Ignoring early carpal tunnel syndrome.
• Delaying DMARD initiation.
• Missing anti-CCP positive early RA.
• Not screening for associated autoimmune diseases.

💎 Clinical Pearls

• MCP involvement strongly suggests RA.
• Anti-CCP predicts erosive disease.
• RA commonly causes carpal tunnel syndrome.
• Vitiligo is autoimmune in origin.
• Early treatment improves long-term outcomes.

📈 Monitoring & Follow-up

• DAS28 score monitoring
• CBC monitoring
• Liver function tests
• ESR and CRP trends
• Radiographic progression
• Functional status assessment

❓ FAQ (Questions & Answers)

1. What is the diagnosis?
   Rheumatoid arthritis with vitiligo.
2. What joints are classically affected?
   MCP and PIP joints.
3. What causes morning stiffness?
   Inflammatory synovitis.
4. What is pannus?
   Inflamed synovium causing joint destruction.
5. Most specific antibody?
   Anti-CCP antibody.
6. What does Tinel's sign indicate?
   Median nerve compression.
7. Why does RA cause carpal tunnel?
   Synovial inflammation compresses the median nerve.
8. What causes vitiligo?
   Autoimmune melanocyte destruction.
9. First-line DMARD?
   Methotrexate.
10. Best test for early synovitis?
    Musculoskeletal ultrasound.
11. What is DAS28?
    RA disease activity score.
12. What are rheumatoid nodules?
    Extra-articular inflammatory nodules.
13. What predicts severe disease?
    High anti-CCP titers.
14. Why is early diagnosis important?
    Prevents irreversible joint damage.
15. Can RA coexist with vitiligo?
    Yes, both are autoimmune diseases.

📖 Key Guidelines & References

• ACR Rheumatoid Arthritis Guidelines
• EULAR RA Recommendations
• Harrison's Principles of Internal Medicine
• Oxford Handbook of Rheumatology
• BMJ Best Practice
• UpToDate Rheumatoid Arthritis Review

https://www.effectivecpmnetwork.com/p6x5cixrpy?key=0e3ba72754512fdd23ee8b77a5e394ed

🔎Keywords

Rheumatoid Arthritis Quiz, RA MCQ, Vitiligo Quiz, Anti CCP Antibody, Inflammatory Arthritis, MCP Joint Swelling, Carpal Tunnel Syndrome, Rheumatology MCQ, Internal Medicine Quiz, Autoimmune Disease Questions

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