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Radiofrequency Ablation of Hepatocellular Carcinoma: Can Subcapsular Tumors Be Safely Ablated?

Young Jun Kim1,2, Steven S. Raman1, Nam C. Yu1, Ronald W. Busuttil3, Myron Tong4 and David S. K. Lu1

1 Department of Radiology, David Geffen School of Medicine at UCLA, 10833 Le Conte Ave., Los Angeles, CA 90095-1721.
2 Present address: Department of Radiology, Konkuk University Hospital, Seoul 143-729, Korea.
3 Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA.
4 Department of Digestive Diseases, David Geffen School of Medicine at UCLA, Los Angeles, CA.


Figure 1
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  		Fig. 1A —74-year-old woman with subcapsular hepatocellular carcinoma. T2-weighted transverse MR image shows 3-cm subcapsular mass with heterogeneous high signal intensity in liver dome (arrows).

 

Figure 2
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  		Fig. 1B —74-year-old woman with subcapsular hepatocellular carcinoma. Portal phase CT scan after radiofrequency ablation shows complete necrosis of index tumor (arrows).

 

Figure 3
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  		Fig. 1C —74-year-old woman with subcapsular hepatocellular carcinoma. Portal phase CT scans after radiofrequency ablation (below level in B) show ablated zone (arrows, C) and thermocoagulated needle track (arrowheads) traversing nontumorous liver parenchyma.

 

Figure 4
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  		Fig. 1D —74-year-old woman with subcapsular hepatocellular carcinoma. Portal phase CT scans after radiofrequency ablation (below level in B) show ablated zone (arrows, C) and thermocoagulated needle track (arrowheads) traversing nontumorous liver parenchyma.

 

Figure 5
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  		Fig. 2 —Graph shows overall survival rates in patients with single hepatocellular carcinoma (HCC) treated with radiofrequency ablation. No significant difference was noted between subcapsular (solid line) (n = 15) and nonsubcapsular (dotted line) (n = 27) HCC groups (p = 0.78, log-rank test).

 

Figure 6
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  		Fig. 3 —Graph shows event-free survival rates in patients with single hepatocellular carcinoma (HCC) treated with radiofrequency ablation. No significant difference was noted between subcapsular (solid line) (n = 15) and nonsubcapsular (dotted line) (n = 27) HCC groups (p > 0.99, log-rank test).

 

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