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An example for radiofrequency ablation (RFA). The patient is an 83-year-old female with metachronous liver metastasis from sigmoid colon cancer. During the surveillance 2 years after sigmoidectomy, the patient was found to have a lesion in the segment III. (A) Preoperative lesion (red circle), 1.39 cm × 1.30 cm on the segment III; (B) 3-month postoperative lesion; and (C) local recurrence medial to the previous ablation site in 15-month follow-up imaging.
