Diagnostic Approaches for Large Vessel Vasculitides

Area of Science:

• Rheumatology and Immunology
• Vascular Medicine
• Diagnostic Imaging

Background:

• Large vessel vasculitides (LVV) encompass giant cell arteritis (GCA), Takayasu arteritis (TAK), and chronic periaortitis.
• Accurate diagnosis relies on clinical criteria, imaging, and biopsy (for GCA).

Purpose of the Study:

• To review the diagnostic modalities for large vessel vasculitides, focusing on GCA and TAK.
• To elucidate the roles of clinical criteria, biopsy, and various imaging techniques in LVV diagnosis.

Main Methods:

• Review of diagnostic approaches including clinical criteria (ACR classification), temporal artery biopsy, and imaging techniques.
• Discussion of imaging modalities: Ultrasound, MRI (including MRA), CT (including CTA), and 18F-Fluorodeoxyglucose Positron Emission Tomography (FDG-PET).
• Emphasis on recommended imaging for GCA and TAK (Ultrasound, FDG-PET, MRI) and their findings (arterial wall thickening, aneurysms, stenoses).

Main Results:

• Ultrasound, MRI, and CT visualize arterial wall thickening, aneurysms, and stenoses.
• FDG-PET highlights inflamed arterial walls by showing increased metabolic activity.
• Ultrasound, FDG-PET, and MRI are recommended for GCA and TAK; FDG-PET is valuable for atypical presentations.

Conclusions:

• Prompt corticosteroid treatment is crucial for suspected GCA with visual disturbances, irrespective of immediate imaging results.
• Comprehensive evaluation integrating clinical assessment, biopsy, and advanced imaging like FDG-PET ensures accurate LVV diagnosis.
• The choice of diagnostic modality depends on the clinical presentation and suspected type of large vessel vasculitis.