TY - JOUR T1 - Is <sup>18</sup>F Fluorodeoxyglucose Positron Emission Tomography Useful to Assess Activity of Myositis? JF - The Journal of Rheumatology JO - J Rheumatol SP - 91 LP - 91 DO - 10.3899/jrheum.121092 VL - 40 IS - 1 AU - NICOLÒ PIPITONE AU - ANNIBALE VERSARI AU - CARLO SALVARANI Y1 - 2013/01/01 UR - http://www.jrheum.org/content/40/1/91.2.abstract N2 - To the Editor:We read with great interest the paper by Owada, et al1 that evaluated the role of 18F fluorodeoxyglucose positron emission tomography (FDG-PET) in assessing activity of myositis. The authors found that FDG-PET was highly specific (97%) in discriminating patients with myositis from unaffected controls. However, the sensitivity of FDG-PET was only 33%. In contrast, in a study published in 20122, we found that FDG-PET was 75% sensitive and 100% specific in distinguishing patients with active myositis from unaffected controls.How can these discordant findings be reconciled? The main reason for such discrepancies lies in the … Address correspondence to Dr. C. Salvarani, Rheumatology Unit, Arcispedale Santa Maria Nuova, Viale Risorgimento 80, 42123 Reggio Emilia, Italy. E-mail: Salvarani.carlo{at}asmn.re.it ER -