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