Vasculitis mimics.

Area of Science:

• Rheumatology
• Vascular Medicine
• Genetics

Background:

• Primary vasculitides present with diverse clinical, radiologic, and pathologic features.
• Numerous disorders can mimic the presentation of primary vasculitides, complicating diagnosis.
• Accurate diagnosis is essential to guide appropriate treatment and avoid iatrogenic harm.

Purpose of the Study:

• To review recently described and under-recognized syndromes that mimic primary vasculitides.
• To highlight differential diagnoses that can be mistaken for vasculitis.
• To emphasize the importance of identifying non-inflammatory mimics.

Main Methods:

• Literature review of recently described and under-recognized syndromes mimicking vasculitis.
• Focus on genetic disorders, medium-vessel mimics, small-vessel mimics, and cerebral vasculitis mimics.
• Analysis of diagnostic challenges and implications for patient management.

Main Results:

• Hereditary disorders like Marfan's, Loeys-Dietz, and Ehlers-Danlos syndrome type IV mimic large-artery aneurysms.
• Segmental arterial mediolysis and Grange syndrome mimic medium-vessel vasculitis.
• Cocaine-induced lesions and reversible cerebral vasoconstriction syndromes are key mimics of small-vessel and cerebral vasculitis, respectively.

Conclusions:

• Diagnosing vasculitis requires comprehensive evaluation of clinical, laboratory, radiologic, and pathologic data.
• Awareness of non-inflammatory mimics is critical to prevent misdiagnosis and inappropriate immunosuppressive therapy.
• Distinguishing vasculitis from its mimics ensures correct management and improves patient outcomes.