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Axial images in a 48-year-old woman with a history of left breast cancer metastatic to lung and bone obtained to monitor response during chemotherapy. (a) Contrast-enhanced T1-weighted MR and (b) T1-weighted MR/PET images show several lung metastases (white arrow). (c) B60 kernel CT and (d) PET/CT images show these metastases (white arrow) more clearly. An expansile rib metastasis (black arrow) is seen on all images.
