RT Journal Article SR Electronic T1 Atlas for the OMERACT thumb base osteoarthritis MRI scoring system (TOMS) JF RMD Open JO RMD Open FD EULAR SP e000583 DO 10.1136/rmdopen-2017-000583 VO 4 IS 1 A1 Féline P B Kroon A1 Charles G Peterfy A1 Philip G Conaghan A1 Violaine Foltz A1 Frédérique Gandjbakhch A1 Iris Eshed A1 Harry K Genant A1 Mikkel Østergaard A1 Monique Reijnierse A1 Johan L Bloem A1 Ida K Haugen A1 Margreet Kloppenburg YR 2018 UL http://rmdopen.bmj.com/content/4/1/e000583.abstract AB This paper presents an atlas for the Outcome Measures in Rheumatology Clinical Trials (OMERACT) thumb base osteoarthritis MRI scoring system (TOMS). The atlas includes reference images of each grade of each feature that is assessed in TOMS (synovitis grade 0–3, subchondral bone defects grade 0–3, osteophytes grade 0–3, cartilage assessment grade 0–3, subluxation and bone marrow lesions grade 0–3) in the first carpometacarpal and scapho-trapezio-trapezoid joint. The presented reference images can be used to guide scoring of thumb base MRIs in patients with hand osteoarthritis according to the OMERACT TOMS.