Abstract
Purpose
To evaluate the sensitivity and specificity of PET/CT findings in PMR and generate a diagnostic algorithm utilizing a minimum number of musculoskeletal sites.
Methods
Steroid-naïve patients with newly diagnosed PMR (2012 EULAR/ACR classification criteria) were prospectively recruited to undergo whole-body 18F−FDG PET/CT. Each PMR case was age- and sex-matched to four PET/CT controls. Control scan indication, diagnosis and medical history were extracted from the clinical record. Qualitative and semi-quantitative scoring (maximum standardized uptake value [SUVmax]) of abnormal 18F-FDG uptake at 21 musculoskeletal sites was undertaken for cases and controls. Results informed the development of a novel PET/CT diagnostic algorithm using a classification and regression trees (CART) method.
Results
Thirty-three cases met the inclusion criteria and were matched to 132 controls. Mean age was 68.6 ± 7.4 years for cases compared with 68.2 ± 7.3 for controls, and 54.5% were male. Median CRP was 49 mg/L (32–65) and ESR 41.5 mm/h (24.6–64.4) in the PMR group. The predominant control indication for PET/CT was malignancy (63.6%). Individual musculoskeletal sites proved insufficient for diagnostic purposes. A novel algorithm comprising 18F-FDG uptake ≥ 2 adjacent to the ischial tuberosities in combination with either abnormalities at the peri-articular shoulder or interspinous bursa achieved a sensitivity of 90.9% and specificity of 92.4% for diagnosing PMR.
Conclusions
The presence of abnormal 18F-FDG uptake adjacent to the ischial tuberosities together with findings at the peri-articular shoulder or interspinous bursa on whole-body PET/CT is highly sensitive and specific for a diagnosis of PMR.
Trial registration
Clinical Trial Registration: Australian New Zealand Clinical Trials Registry, http://www.anzctr.org.au, ACTRN1261400696695
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Funding
This work was funded by an unrestricted educational grant from Abbvie. Author CO has received research grants from Arthritis Australia and Austin Medical Research Foundation. Author AS is supported by an NHMRC Senior Practitioner Fellowship (APP1084178).
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Author CO has received speaking honoraria from Roche, Janssen and Pfizer and meeting sponsorship from Roche. Author AP declares no conflict of interest. Author VY declares no conflict of interest. Author CM declares no conflict of interest. Author SL declares no conflict of interest. Author DL declares no conflict of interest. Author JL has received a speaking honorarium from Abbvie and meeting sponsorship from Gilead. Author AS declares no conflict of interest. Author RB declares no conflict of interest.
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All procedures performed in this study were carried out in accordance with the ethical standards of the Austin Health Human Research Ethics Committee (HREC/14/Austin/158).
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Informed consent was obtained from all individual participants included in the study.
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Owen, C.E., Poon, A.M.T., Yang, V. et al. Abnormalities at three musculoskeletal sites on whole-body positron emission tomography/computed tomography can diagnose polymyalgia rheumatica with high sensitivity and specificity. Eur J Nucl Med Mol Imaging 47, 2461–2468 (2020). https://doi.org/10.1007/s00259-020-04731-z
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DOI: https://doi.org/10.1007/s00259-020-04731-z