• Hubert de Boysson, Nicolas Aide, Eric Liozon, Marc Lambert, Jean-Jacques Parienti, Jacques Monteil, Damien Huglo, Boris Bienvenu, Alain Manrique, and Achille Aouba.
• Department of Internal Medicine, Caen University Hospital, France; University of Caen - Basse Normandie, Caen, France. Electronic address: deboysson-h@chu-caen.fr.
• Eur. J. Intern. Med. 2017 Dec 1; 46: 66-70.

Objective18F-FDG PET/CT can detect large-vessel involvement in giant-cell arteritis (GCA) with a good sensitivity. In patients with clinically and biologically controlled disease, we aimed to assess how vascular uptakes evolve on repetitive FDG-PET/CT.Patients And MethodsAll included patients had to satisfy the 4 following criteria: 1) diagnosis of GCA was retained according to the criteria of the American College of Rheumatology or based on the satisfaction of 2 criteria associated with the demonstration of large-vessel involvement on FDG-PET/CT; 2) all patients had a positive PET/CT that was performed at diagnosis before treatment or within the first 10days of treatment; 3) another FDG-PET/CT was performed after at least 3months of controlled disease without any relapse; 4) patients were followed-up at least for 12months.ResultsTwenty-five patients (17 [68%] women, median age: 69 [65-78]) with large-vessel inflammation on a baseline FDG-PET/CT and with repetitive imaging during the period with controlled disease were included and followed-up for 62 [25-95] months. Four repeated procedures revealed total extinction of vascular uptakes at 11.5 [8-12] months after the first FDG-PET/CT. Eight PET/CT revealed decreased numbers of vascular uptakes, and 10 procedures revealed no changes. The 3 remaining procedures indicated worsening of the numbers of vascular uptakes in the absence of relapse.ConclusionsOur study revealed long-term persistent vascular uptake on repeated FDG-PET/CT in >80% of our GCA patients with large-vessel inflammation and clinical-biological controlled disease. Prospective studies are required to confirm these findings.Copyright © 2017 European Federation of Internal Medicine. Published by Elsevier B.V. All rights reserved.

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