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Measurement of gas zones at completion of ablation on CT (A), US (B), and with a corresponding tissue slice stained with NBT (C). A hypodense zone in (A) and hypoechoic zone in (B) are seen to correlate with the pathologic margin in (C) (blue arrows). On NBT-stained whole mount (C) note the difference between tan-brown char of ablation zone (red arrow) and viable red-purple liver (yellow arrow)
