Diagnostic Value of Whole-Body Magnetic Resonance Imaging for Bone Metastases: A Systematic Review and Meta-Analysis

Purpose: To assess the overall diagnostic accuracy of whole-body magnetic resonance imaging (WB-MRI) in detecting bone metastases with a meta-analysis. Materials and Methods: The MEDLINE, EMBASE, Cancerlit, and Cochrane Library databases were searched from January 1995 to September 2010 for studies evaluating the accuracy of WB-MRI in detecting bone metastases. Histopathologic analysis and/or close clinical and imaging follow-up for at least 6 months was assessed. Meta-analysis methods were used to pool sensitivity and specificity and to construct summary receiver-operating characteristics. Results: A total of 11 studies with 495 patients who fulfilled all of the inclusion criteria were considered for the analysis. No publication bias was found. WB-MRI had a pooled sensitivity of 0.899 (95% confidence interval [CI], 0.845-0.939) and a pooled specificity of 0.918 (95% CI, 0.882-0.946). The subgroup without diffusion-weighted Imaging (DWI) positive results had higher pooled, specificity 0.961 (95% CI, 0.922-0.984) than the subgroup with DWI (P < 0.05). Conclusion: WB-MRI was an accurate, cost-effective tool in detecting bone metastases. WB-MRI without DWI may improve the specificity of detecting bone metastases. DWI seems to be a sensitive but rather unspecific modality for the detection of bone metastatic disease. High-quality prospective studies regarding WB-MRI in detecting bone metastases still need to be conducted.