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Fig. 2. —Diagram shows size of lesions induced by administration of radiofrequency with cooled-tip needle ([UNK]) and with expandable needle (x). Longest dimension is x-axis, and shortest dimension is y-axis. Note that lesions induced with cooled-tip needle electrode are larger than those produced with expandable needle electrodes. Also, note that expandable needle electrodes produced lesions that were more spheric than those produced with the cooled-tip needle.

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