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Fig. 4B. —36-year-old asymptomatic woman with congenital absence of portal vein and large regenerative nodules. Transverse gradient-echo T1-weighted MR image (120/4; flip angle, 80°) obtained in arterial phase 25 sec after bolus administration of gadopentetate dimeglumine reveals many more nodules, as brightly enhancing hyperintense lesions (long arrows), some with peripheral hypointense rim (short arrows).