Imaging findings after radiofrequency ablation of XXXX .

@entity5 @entity1 @entity1410
OBJECTIVE: The purpose of this study was to describe the imaging findings after radiofrequency ablation of @entity5 . MATERIALS AND METHODS: We retrospectively reviewed the imaging findings of all @entity1 with @entity5 treated with radiofrequency ablation in our department from January 2001 through August 2009. The studies were reviewed in consensus by two attending abdominal imaging radiologists and an abdominal imaging fellow. Imaging findings before, immediately after, and at short- and long-term follow-up after ablation were recorded. RESULTS: Fourteen @entity1 (seven @entity1 , seven @entity1 ; mean age, 56    8.4 years) underwent radiofrequency ablation of @entity5 . One case of small pneumothorax and one case of small hemothorax were the only minor complications (complication rate, 14%). The expected side effects of radiofrequency ablation were found in 35% of @entity1 : in two @entity1 adjacent liver parenchyma was ablated, in two @entity1 the diaphragmatic crus was injured, and in two @entity1 local @entity1410 occurred (in one @entity1 , both adjacent liver and diaphragmatic crus were ablated). Immediate soft-tissue findings after radiofrequency ablation included air bubbles in 12 @entity1 (86%) and fat stranding around the adrenal gland in 13 @entity1 (93%). A fat rim sign was found in 60% of @entity1 at long-term follow-up. The attenuation of the @entity5 immediately after the procedure increased an average of 7 HU (median, 5 HU; range, -2 to 18 HU) and tended to decrease in long-term follow-up. At long-term follow-up, most (75%) of the @entity5 had decreased in size and attenuation. CONCLUSION: Air bubbles and fat stranding are frequently seen immediately after radiofrequency ablation of @entity5 . A fat rim sign is a common finding at long-term follow-up. Attenuation of the ablated zone increases immediately after the procedure and decreases in long-term follow-up. The volume of the ablated zone has a variable size response, suggesting the need for baseline imaging.
