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Fig. 4C. —Focal nodular hyperplasia in 32-year-old woman with weak enhancement after administration of gadolinium chelates and typical enhancement after administration of ferumoxides and mangafodipir trisodium. Gadolinium chelates—enhanced dynamic T1-weighted gradient-recalled echo MR image obtained during arterial dominant phase reveals lesion (arrow) to be isointense to liver parenchyma. This finding is atypical.