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《Radiologic Practice》 2006-10
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CT Appearances of Malignant Liver Tumors after Local Electromagnetic Wave Thermal Ablation

GUAN Jian,HU Dao-yu,YANG Guo-hua.Department of Radiology,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430030,P.R.China  
Objective:To analyze CT appearances of malignant liver tumors after local electromagnetic wave thermal ablation microwave thermal ablation (MTA) or radiofrequency ablation (RFA).Methods:CT scans were performed for twenty-six patients with malignant liver tumors 2 weeks after local electromagnetic wave thermal ablation.The examination was repeated within 3 months.CT features of liver morphological changes and of local complications after the thermal ablation were analyzed,combined with clinical symptoms and lab dada.Results:In 18 cases without abnormal changes,the first postoperative CT scan 2 weeks after the thermal ablation showed well-outlined low density area which appeared bigger than the original size of the tumors,and there was no enhancement in the area.The margin of the low density area showed a faint rim-like enhancement.After a few months,the low density area became smaller and its size was similar to that of the original tumor,the rim-like enhancement of the margin faded gradually and disappeared.In 4 cases of recurrence,CT scans showed the low density lesions of recurrence adjacent to the area of thermal ablation.In 2 cases of bile duct injury,CT scans showed dilation of bile duct near the area of thermal ablation.In 1 case of pseudocyst (biloma),CT scans showed a cyst-like low density area without enhancement adjacent to the area of electromagnetic wave thermal ablation.In 1 case of fistula between liver and skin with pleural effusions,CT scans showed a fistulous tract with air communicating the liver and skin.Conclusion:CT scans can accurately demonstrate the morphological changes of liver and local complications after electromagnetic wave thermal ablation of malignant liver lesions.
【CateGory Index】: R735.7
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