Abstract
Thirty-five patients with 53 nodules (HCC/Meta = 35/18) were treated with radiofrequency ablation (RFA) using RITA Model 90 device. Model 90 has nine hook-shaped expandable electrode tines with a maximum deployment diameter of 5.0 cm. 37 nodules were treated with RFA alone. 6 nodules ware treated with combination of RFA and occlusion of both hepatic artery and portal vein. 5 nodules were treated with a combination of RFA and chemoembolization. The thermal areas using an electrode with a 4 cm deployment and 5 cm deployment (4 cm : 48.0 × 44.9 mm, 5 cm : 52.1 × 47.7 mm) were significantly larger than those using an electrode with a 3 cm deployment (38.7 × 32.6 mm). The thermal areas treated by combination therapy were larger than those treated RFA alone. Our experience suggests that RFA with Model 90 is effective in the treatment of hepatic tumor equal to or smaller than 35 mm, and RFA with occlusion of blood flow is effective for tumors larger than 35 mm.
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