RT Journal Article SR Electronic T1 Developing a magnetic resonance imaging scoring system for peripheral psoriatic arthritis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 859 OP 861 VO 34 IS 4 A1 Fiona McQueen A1 Marissa Lassere A1 Paul Bird A1 Espen A Haavardsholm A1 Charles Peterfy A1 Philip G Conaghan A1 Bo Ejbjerg A1 Harry Genant A1 Philip O'Connor A1 Paul Emery A1 Mikkel Østergaard YR 2007 UL http://www.jrheum.org/content/34/4/859.abstract AB We describe the first steps in developing an OMERACT magnetic resonance imaging (MRI) scoring system for peripheral psoriatic arthritis (PsA). A preexisting MRI dataset (finger joints) from 10 patients with PsA was scored by 4 readers for bone erosion, bone edema, synovitis, tendinopathy, and extracapsular features of inflammation (including enthesitis) according to specified criteria. Scoring reliability between readers was moderate to high for bone edema and erosion, but lower for soft tissue inflammation. Measures to improve reliability for future exercises will include reviewing definitions of pathological features and prior reader calibration.