Response to Treatment in IgG4-Related Disease Assessed by Quantitative PET/CT Scan

Objective The aim of this study was to assess disease activity by different PET/CT measurements in IgG4-related disease (IgG4-RD) flares and their correlation with the IgG4-RD responder index (IgG4-RI). Patients and Methods Patients were retrospectively recruited from a single center in Barcelona, Spain. They all had IgG4-RD flares with an 18 F-FDG PET/CT examination performed within the 2 first weeks of the flare onset and another one after at...