Percutaneous RFA in a 70-year-old female.Non-contrast axial CT image showing hyperattenuating iodine-containing fluid (asterisk) instilled for hydrodissection through a 22-guage needle (white arrowhead), leading to the displacement of the colon (C) and duodenum (D) neighboring the renal cell carcinoma. One (black arrowhead) of the three RF electrodes is placed within the tumor (arrow), and RFA is performed using a switching controller. RFA = radiofrequency ablation