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Our objective was to compare the diagnostic accuracy of an all-in-one protocol of whole-body ¹⁸F-FDG PET/CT and integrated ¹⁸F-FDG PET/CT mammography with the diagnostic accuracy of a multimodality algorithm for initial breast cancer staging. Forty women (mean age, 58.3 y; range, 30.8–78.4 y; SD, 12 y) with suspected breast cancer were included. For the primary tumor, we compared ¹⁸F-FDG PET/CT mammography versus MRI mammography; for axillary lymph node status, ¹⁸F-FDG PET/CT versus clinical investigation and ultrasound; and for distant metastases, ¹⁸F-FDG PET/CT versus a multimodality staging algorithm. Histopathology and clinical follow-up served as the standard of reference. The Fisher exact test evaluated the significance of differences (P < 0.05). Alterations in patient management caused by ¹⁸F-FDG PET/CT were documented. No significant differences were found …