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Zorluk: OrtaRheumatology and Immunology

Systemic vasculitides often present with a wide spectrum of overlapping clinical manifestations, but specific patterns of organ involvement, histological features, and autoantibody associations can help differentiate them. Match each of the following vasculitis diagnoses with its classic clinical presentation and associated laboratory findings.

  • Granulomatosis with polyangiitis (GPA)Upper respiratory tract involvement (e.g., saddle nose deformity), lower respiratory tract cavitary nodules, and rapidly progressive glomerulonephritis; strongly associated with PR3-ANCA.
  • Eosinophilic granulomatosis with polyangiitis (EGPA)Late-onset asthma, chronic rhinosinusitis, and peripheral neuropathy (e.g., mononeuritis multiplex); associated with peripheral eosinophilia and MPO-ANCA.
  • Microscopic polyangiitis (MPA)Necrotizing glomerulonephritis and pulmonary capillaritis leading to alveolar hemorrhage, without granulomatous inflammation or upper airway disease; strongly associated with MPO-ANCA.
  • Polyarteritis nodosa (PAN)Segmental transmural inflammation of medium-sized arteries frequently sparing the lungs; highly associated with viral hepatitis B infection and renal microaneurysms.
  • IgA vasculitisPalpable purpura predominantly on the lower extremities, migratory arthralgias, and abdominal pain; characterized by immune complex deposition and often following a viral upper respiratory infection.

Cevap

Granulomatosis with polyangiitis (GPA) matches with upper respiratory tract involvement, lower respiratory tract nodules, and PR3-ANCA. Eosinophilic granulomatosis with polyangiitis (EGPA) matches with asthma, eosinophilia, and MPO-ANCA. Microscopic polyangiitis (MPA) matches with pulmonary capillaritis and glomerulonephritis without granulomas, associated with MPO-ANCA. Polyarteritis nodosa (PAN) matches with medium vessel inflammation sparing the lungs, associated with Hepatitis B. IgA vasculitis matches with palpable purpura, arthralgias, and abdominal pain.
Each vasculitis has a distinct clinical and pathophysiological profile that allows for specific identification based on organ involvement, histological presence of granulomas, and specific autoantibodies (such as PR3-ANCA and MPO-ANCA).

Adım Adım Çözüm

1
Identify the key clinical features and serological markers for Granulomatosis with polyangiitis.
Matches with upper airway disease, lung nodules, glomerulonephritis, and PR3-ANCA.
GPA is defined by this classic clinical triad and its strong association with PR3-ANCA.
2
Identify the unique features of Eosinophilic granulomatosis with polyangiitis.
Matches with asthma, allergic rhinosinusitis, peripheral neuropathy, and eosinophilia.
The presence of asthma and significant eosinophilia are the defining features of EGPA among the ANCA-associated vasculitides.
3
Differentiate Microscopic polyangiitis from GPA.
Matches with necrotizing glomerulonephritis and pulmonary capillaritis, but lacks granulomas and upper airway disease, associated with MPO-ANCA.
MPA causes pulmonary-renal syndrome similar to GPA but is histologically distinct (no granulomas) and typically MPO-ANCA positive.
4
Identify the characteristic features of Polyarteritis nodosa.
Matches with segmental inflammation of medium arteries sparing the lungs, associated with hepatitis B.
Lung sparing and a strong association with hepatitis B virus are classic high-yield identifiers for PAN.
5
Identify the classic presentation of IgA vasculitis.
Matches with palpable purpura, arthralgias, and abdominal pain.
This is the classic tetrad of symptoms resulting from IgA immune complex deposition in small vessels.

Anahtar Kavram

Clinical and serological differentiation of systemic vasculitides.
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Konular

Rheumatology and Immunology

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