Pitfalls in MR morphology of the sterno-costo-clavicular region using whole-body MRI
Introduction
Inflammatory involvement of the sterno-costo-clavicular (SCC) region in patients with spondyloarthritis (SpA) is a well-known1, 2, 3 but often a neglected disease manifestation, except in patients primarily presenting with hyperostotic and/or sclerotic SCC changes, such as SCC hyperostosis and pustulotic arthro-osteitis.3 Conventional magnetic resonance imaging (MRI) of the SCC region is, therefore, rarely performed routinely even in the presence of SCC pain in SpA patients. The increasing use of whole-body (WB) MRI in the diagnosis of SpA offers an opportunity to evaluate inflammation of the SCC region in addition to the entire spine and the sacroiliac joints.4, 5, 6, 7, 8, 9 Frequent involvement of the SCC joints in SpA has been confirmed by WB MRI, being present in 72 (59%) of 122 SpA patients.6 SCC involvement was more frequent in ankylosing spondylitis compared with SpA patients not fulfilling the modified New York criteria for ankylosing spondylitis,10 occurring in 65% and 37% of the patients, respectively. The manubriosternal joint (MSJ) was the most frequently affected SCC joint both in ankylosing spondylitis and in patients with other forms of SpA.6 However, in the same study 15 of 75 (20%) healthy controls were found to have changes in the SCC region by WB MRI simulating SpA lesions.6 These findings in healthy individuals have not been analysed in detail.
The purpose of this study was to analyse and describe the SCC findings in healthy individuals using WB MRI to minimize misinterpretation as SpA changes.
Section snippets
Patients
As part of a controlled, cross-sectional study of 122 consecutive SpA patients at a University Hospital, a control group of 75 healthy volunteers was recruited from the staff of the hospital.6 The control subjects had no clinical sign of SpA, notably psoriasis, inflammatory bowel disease, reactive arthritis, uveitis and enthesitis, and did not have clinically relevant back pain according to the Nordic questionnaire.11 The control group represents the present study group and encompassed 42 males
Results
Changes in the SCC region simulating inflammation were reported by the majority of readers in 15 (20%) healthy individuals (12 male/3 female); median age 32.1 years (range 20.2–48 years). MRI lesions compatible with erosion were observed in 12%, FSI in 5.3%, and BMO in 9.3% of the individuals, respectively, whereas BMO was the most frequent finding in the SpA patients (Table 1).
Nearly all lesions observed in healthy individuals occurred at the MSJ (8% for BMO, 9.3% for erosion, 4% for FSI),
Discussion
The present study on WB MRI of the SCC region showed changes simulating erosion, FSI and/or BMO in 20% of healthy individuals. Nearly all lesions observed in healthy persons occurred at the MSJ. The MSJ was also the most frequently affected joint in SpA patients by WB MRI, but the low frequency of SClJ changes in healthy individuals was in contrast to the findings in SpA where BMO, erosion, and FSI at the SClJ occurred in 23.8%, 11.5%, and 10.7% of the patients, respectively. Signs simulating
Acknowledgements
The present work was supported by the Walter L. and Johanna Wolf Foundation, Zurich, Switzerland, and the Foundation for Scientific Research at the University of Zurich, Switzerland. Both funding bodies played no role in study design, in the collection and interpretation of data, or in the decision to submit the manuscript for publication.
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