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Fig. 1B. —Cyst (arrow) in 60-year-old man with preoperative examination of colon cancer using superparamagnetic iron oxide–enhanced MRI (category 5). Ferumoxides-enhanced T1-weighted gradient-echo image shows cyst as low intensity relative to liver parenchyma because liver parenchyma increased in signal after contrast administration and cyst did not. This signal-intensity pattern of category 5 is characteristic of cyst.