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Fig. 1C. —47-year-old man with hepatocellular carcinoma who had undergone three transcatheter arterial chemoembolizations. Carbon dioxide (CO₂)–enhanced sonogram shows small viable portion (v) in peripheral region of tumor (arrow) that was not seen on A or B. Five years after patient underwent CO₂-enhanced sonographically guided percutaneous ethanol injection, no evidence of either viable tumor portion or recurrent tumor has been seen. N = nonviable portion of tumor.