Magnetic resonance imaging characteristics of renal tumors after radiofrequency ablation

Urology
Robert S SvatekJeffrey A Cadeddu

Abstract

The interpretation of radiographic findings in renal tumors treated with minimally invasive modalities, such as radiofrequency ablation (RFA), is critical for assessing treatment adequacy. Magnetic resonance imaging (MRI) is commonly used for patients with renal insufficiency or contrast allergy. Because the MRI experience with renal RFA is limited, we reviewed our experience and report the unique MRI characteristics of RFA-treated renal tumors. A single-institution database of renal RFA was reviewed to identify patients followed up with MRI. A radiologist and urologist retrospectively reviewed all MRI scans to identify the characteristic lesion findings after RFA. Eleven patients (12 tumors) treated by RFA were followed up with MRI examinations. The mean follow-up was 10 months. The mean tumor size at ablation was 2.4 cm, with minimal reduction over time. Ablated lesions were characterized by high signal intensity on T1-weighted images, low signal intensity on T2-weighted images, and an absence of contrast enhancement. Of the patients treated by percutaneous RFA, 71% developed a characteristic peritumor halo, seen as a rim of low signal intensity on T1-weighted and T2-weighted images, surrounding a zone of perinephric fat just...Continue Reading

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Citations

Feb 5, 2008·Future Oncology·Adel Abdellaoui, Anthony F Watkinson
Mar 22, 2007·Radiographics : a Review Publication of the Radiological Society of North America, Inc·Geoffrey E WileRonald J Zagoria
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Aug 15, 2006·Current Opinion in Urology

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