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Updated: Feb 14, 2026

Thermal Ablation for the Treatment of Abdominal Tumors
Published on: March 7, 2011
Imaging after radiofrequency ablation of renal tumors
Umberto Russo1, Umberto Maestroni2, Roberto Vito Papapietro1
1Department of Medicine & Surgery, Unit of Radiologic Science, University of Parma, Maggiore Hospital, Via Gramsci 14, Parma, Italy.
Abstract:
The number of percutaneous radiofrequency ablation procedures performed for renal tumors is progressively increasing worldwide. Periodic imaging follow-up has the double role to guarantee the treatment efficacy over time and to early detect any possible complication. Tumor size reductions, as well as the appearance of the characteristic 'halo sign', are normal findings that represent good ablative outcomes. However the most reliable factor of ablation efficacy remains the total absence of contrast enhancing zones within the ablated area. The aim of this article is to illustrate the typical aspect of an effective radiofrequency ablation treatment, which are the imaging findings that may suggest the presence of residual tumoral tissue and which are the main early and late procedural complications.
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