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Difficulty: HardRheumatology and Immunology

Systemic vasculitides often present with overlapping multi-organ involvement, but distinct clinicopathologic features and specific infectious associations can differentiate them. Match each patient's clinical presentation with the most likely specific systemic vasculitis diagnosis.

  • A patient presents with recurrent epistaxis, cavitary lung lesions, and red blood cell casts. Biopsy of a nasal lesion reveals necrotizing vasculitis with extravascular granulomatous inflammation.Granulomatosis with polyangiitis
  • A patient with refractory adult-onset asthma and chronic rhinosinusitis develops a sudden right-sided wrist drop. Laboratory studies show marked peripheral eosinophilia.Eosinophilic granulomatosis with polyangiitis
  • A patient with chronic hepatitis B infection develops severe postprandial abdominal pain, weight loss, and livedo reticularis. Pulmonary imaging is unremarkable, but mesenteric angiography demonstrates focal arterial microaneurysms.Polyarteritis nodosa
  • A patient with chronic hepatitis C infection presents with palpable purpura, arthralgias, and profound fatigue. Laboratory evaluation is notable for a positive rheumatoid factor and a significantly decreased C4 complement level.Cryoglobulinemic vasculitis

Answer

The correct pairings match Granulomatosis with polyangiitis to the patient with cavitary lung lesions, epistaxis, and granulomas; Eosinophilic granulomatosis with polyangiitis to the patient with asthma, eosinophilia, and wrist drop; Polyarteritis nodosa to the patient with hepatitis B, mesenteric microaneurysms, and lung sparing; and Cryoglobulinemic vasculitis to the patient with hepatitis C, palpable purpura, and low C4.
Each systemic vasculitis presents with a unique clinicopathologic signature. Granulomatosis with polyangiitis (GPA) is characterized by necrotizing granulomatous inflammation affecting the upper airway, lower airway, and kidneys. Eosinophilic granulomatosis with polyangiitis (EGPA) is distinguished by an allergic phenotype, adult-onset asthma, and marked eosinophilia. Polyarteritis nodosa (PAN) affects medium-sized arteries, causing microaneurysms and tissue ischemia (e.g., mesenteric), uniquely associating with Hepatitis B while sparing the pulmonary circulation. Cryoglobulinemic vasculitis is strongly linked to Hepatitis C, presenting with palpable purpura, arthralgias, and mixed cryoglobulins that consume complement (low C4) and exhibit rheumatoid factor activity.

Step-by-Step Solution

1
Analyze the first clinical presentation focusing on upper/lower respiratory tract symptoms and renal findings.
The triad of recurrent epistaxis, cavitary lung lesions, and glomerulonephritis with granulomatous inflammation identifies Granulomatosis with polyangiitis (GPA).
GPA is defined by necrotizing granulomatous inflammation of the respiratory tract and necrotizing glomerulonephritis.
2
Evaluate the second presentation noting the atopic history and neurological deficits.
The combination of refractory asthma, prominent peripheral eosinophilia, and mononeuritis multiplex (wrist drop) identifies Eosinophilic granulomatosis with polyangiitis (EGPA).
EGPA uniquely features eosinophil-rich and granulomatous inflammation prominently involving the respiratory tract, heavily associated with asthma and atopy.
3
Review the third presentation emphasizing viral associations and involved vascular beds.
The association with hepatitis B, presentation of mesenteric ischemia (postprandial pain), angiographic microaneurysms, and the specific lack of lung involvement point to Polyarteritis nodosa (PAN).
PAN is a medium-vessel vasculitis that characteristically spares the pulmonary capillaries while frequently targeting mesenteric, renal, and dermatologic vessels.
4
Examine the fourth presentation considering laboratory anomalies and dermatologic findings.
The triad of palpable purpura, arthralgias, and fatigue in the setting of hepatitis C, along with a positive rheumatoid factor and low C4 complement levels, identifies Cryoglobulinemic vasculitis.
Mixed cryoglobulinemia is largely driven by hepatitis C infection, and the cryoglobulins consume complement (especially C4) while demonstrating rheumatoid factor activity.

Key Concept

Differentiating systemic vasculitides based on classic clinical phenotypes, histopathology, and associated infectious etiologies.
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Topics

Rheumatology and Immunology

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