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Fig. 4B. —Metastatic tumor (arrow) in 59-year-old woman with follow-up examination of colon cancer using superparamagnetic iron oxide–enhanced MRI (category 3). Ferumoxides-enhanced T1-weighted gradient-echo image shows metastasis as low intensity relative to liver parenchyma. This signal-intensity pattern of category 3 is characteristic for solid lesion, indicating metastatic liver tumor.