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Fig. 2E. —74-year-old woman with lung metastases from colorectal carcinoma. MR image obtained with gadolinium 2 months after radiofrequency ablation shows cavitated area appears moderately enlarged; surrounding envelope has less thickness; and necrotic fragments of treated lesion, which adhere to very hyperintense internal surface, are unenhanced. Note that envelope includes more dorsal branch of right superior pulmonary vein (arrow), which is partially surrounded by necrotic fragment of treated lesion. See Miao et al. [29].