Figure 5c. Induced thermal lesion in the left lower pole of the kidney despite a distance of 3 cm between the ablation needle and the kidney. (a) US image shows a hyperechogenic thermal lesion (arrow) with fluid (arrowheads) around the lower pole of the kidney (US probe orientation parallel to the long axis of the kidney). (b) Contrast-enhanced harmonic US scan obtained 10 minutes after ablation shows a perfusion deficit in the cortex of the kidney (arrow). (c) Photomicrograph shows a bandlike thermal lesion in the lower pole kidney parenchyma (*), with neutrophil and macrophage infiltration toward the normal parenchyma (arrow). (Hematoxylin-eosin stain; original magnification, x40.)