Imaging of pulmonary vasculitis.

Area of Science:

• Pulmonology
• Rheumatology
• Immunology

Background:

• Pulmonary vasculitis presents with diverse symptoms including diffuse pulmonary hemorrhage, glomerulonephritis, sinusitis, and skin purpura.
• Diagnostic challenges arise from non-specific imaging findings and overlapping clinical features.

Purpose of the Study:

• To outline the diagnostic approach for pulmonary vasculitis.
• To emphasize the integration of clinical, laboratory, and imaging data for accurate diagnosis.

Main Methods:

• Review of clinical presentations suggestive of pulmonary vasculitis.
• Analysis of serologic tests, including cytoplasmic and perinuclear antineutrophil cytoplasmic antibodies (ANCA).
• Evaluation of imaging findings and a pattern-based approach for differential diagnosis.

Main Results:

• Positive cytoplasmic ANCA is highly specific for ANCA-associated granulomatous vasculitis with typical clinical features.
• Perinuclear ANCA positivity suggests Churg-Strauss syndrome or microscopic polyangiitis.
• A pattern-based approach to imaging aids in narrowing the differential diagnosis of pulmonary vasculitides.

Conclusions:

• Accurate diagnosis of pulmonary vasculitis requires integrating clinical presentation, serologic results (especially ANCA patterns), and characteristic imaging findings.
• A comprehensive diagnostic strategy is essential for differentiating various forms of pulmonary vasculitis.