The diagnosis of vasculitis

Area of Science:

• Rheumatology
• Immunology
• Internal Medicine

Background:

• Primary systemic vasculitis diagnosis is challenging due to its heterogeneous nature.
• Early diagnosis is critical to initiate therapy and prevent organ damage and poor prognosis.
• Anti-neutrophilic cytoplasmic antibody (ANCA) testing has improved the diagnosis of small-vessel vasculitides.

Purpose of the Study:

• To highlight the importance of early diagnosis in primary systemic vasculitis.
• To discuss the diagnostic challenges and available tools for vasculitis.
• To emphasize the role of ANCA testing in specific vasculitis subgroups.

Main Methods:

• Review of diagnostic approaches for primary systemic vasculitis.
• Discussion of the utility of ANCA testing in small-vessel vasculitides.
• Exploration of diagnostic criteria, exclusion of mimics, and role of clinical presentation, laboratory tests, imaging, and histology.

Main Results:

• Heterogeneity of vasculitis poses significant diagnostic challenges.
• ANCA testing is beneficial for identifying and diagnosing a subgroup of small-vessel vasculitides.
• Diagnosis often relies on clinical suspicion, supported by investigations and histology, with observation and therapeutic trials for uncertain cases.

Conclusions:

• Early suspicion and comprehensive investigation are key to diagnosing primary systemic vasculitis.
• ANCA testing is a valuable tool for specific vasculitis subtypes.
• When diagnosis is uncertain, a stepwise approach including observation and therapeutic trials may be necessary.