Abstract
Objective
To determine the diagnostic accuracy of WB-MRI and 18F-FDG PET/CT in detecting infiltration pattern, disease activity, and response to treatment in patients with multiple myeloma (MM).
Materials and methods
Fifty-six patients with confirmed MM were included in the present study for pre-treatment evaluation. Among these individuals, 22 patients were available for the post-treatment evaluation of response to therapy. All patients were imaged with both WB-MRI and 18F-FDG PET/CT. All radiographic findings of infiltration pattern, disease activity, and response to therapy were compared. The diagnostic performance of both modalities was estimated using bone marrow aspirate and biopsy as the reference test.
Results
For detection of active myelomatous tissue at diagnosis, WB-MRI achieved higher sensitivity (94%) than 18F-FDG PET/CT (75%) (p = 0.0039), whereas both modalities achieved the same specificity (80%). For detection of residual myelomatous tissue after treatment, 18F-FDG PET/CT achieved higher specificity (86%) than WB-MRI (43%) (p = 0.0081), whereas both modalities achieved the same sensitivity (75%).
Conclusion
WB-MRI is more sensitive than 18F-FDG PET/CT in the diagnosis of MM before treatment; however, 18F-FDG PET/CT is more specific than WB-MRI in detecting residual involvement in treated patients.
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Abbreviations
- AUC:
-
Area under the curve
- CI:
-
Confidence interval
- 18F-FDG PET/CT:
-
18F-Fluorodeoxyglucose (FDG) positron emission tomography/computed tomography
- IMWG:
-
International Myeloma Working Group
- IMA:
-
Inter-modality agreement
- MIP:
-
Maximum-intensity projection
- MM:
-
Multiple myeloma
- ROC:
-
Receiver-operating characteristic
- SI:
-
Signal intensity
- STIR:
-
Short inversion time inversion recovery
- SUVmax:
-
Maximum standardized uptake value
- WB-MRI:
-
Whole-body magnetic resonance imaging
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Basha, M.A.A., Hamed, M.A.G., Refaat, R. et al. Diagnostic performance of 18F-FDG PET/CT and whole-body MRI before and early after treatment of multiple myeloma: a prospective comparative study. Jpn J Radiol 36, 382–393 (2018). https://doi.org/10.1007/s11604-018-0738-z
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DOI: https://doi.org/10.1007/s11604-018-0738-z