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Large vessel vasculitis (FDG PET-CT)

Case contributed by David Little
Diagnosis almost certain

Presentation

Raised inflammatory markers with no clear cause

Patient Data

Age: 65 years
Gender: Male

FDG PET-CT

Nuclear medicine

Moderate to marked increased tracer uptake is seen throughout the aorta, iliac, femoral, subclavian and axillary arteries reflecting an active large vessel vasculitis. 

Case Discussion

This case demonstrates the typical distribution of active large vessel vasculitis on FDG PET-CT.

EANM/SNMMI guidelines for vasculitis in FDG PET-CT:
•Grade 0: No vascular uptake (≤ mediastinum)
•Grade 1: Vascular uptake < liver uptake
•Grade 2: Vascular uptake = liver uptake, may be PET-positive
•Grade 3: Vascular uptake > liver uptake, considered PET-positive

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