MR features after radiofrequency ablation (RFA).

摘要

A 64-year-old had a right colectomy five years ago for a localised (T3N0M0) colonic cancer. Four years after colonic surgery, three metastases of the right liver lobe were treated by a right hepatectomy. After one year, a 2 cm diameter left liver lobe metastasis was depicted on US follow-up. A radiofrequency ablation (RFA) was performed, under US guidance. MR imaging was performed three months after RFA. On T1 -weighted image (Fig. 1 A), an ovoid lobulated hypo-intense lesion is demonstrated. The margins of the lesion are hyper-intense (white arrow) with a very hypo-intense small round spot corresponding to a gas bubble (dashed arrow).