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(Illustration courtesy of Gerald D. Dodd II, MD, University of Colorado)

Radio Frequency Ablation (RFA): Drawing depicts how the heat expands into the surrounding needles to form a thermal sphere.

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.