You are here: Home / presentations / RF with a novel wet electrode / results

results

 

 

In HCC
Tumor size
complete necrosis
25 mm < Tumor< 35 mm
77 % of cases
Tumor> 35 mm
61 % of cases
In metastases
Tumor < 25 mm
100 % of cases
25 mm < Tumor< 35 mm
76 % of cases
Tumor> 35 mm
42 % of cases

 

  • Ten days after the procedure the patients underwent a MRI scan. The most important features are the size of the necrotic defect, which, immediately after treatment, should be larger than that of the pretreatment tumor, and the sharpness of the margins, which indicates an abrupt change in attenuation between the necrotic tissue and surrounding liver tissue. Enhancement, when present, is due to perfusion abnormality or granulation tissue and forms a regular rim or a homogeneous zone at the margin of the defect. It is seen immediately after ablation but may be prolonged. Enhancement is affected by the scanning technique. Over time, the size of the defect remains stable or decreases. Any variation from this general pattern is suggestive of incomplete ablation or recurrence.
  • In 28% of these cases, a thin regular rim enhancement without nodular pattern was observed. In patients with complete necrosis, the lesion size remained stable on follow up MRI or progressively decreased in size. Residual tumors show a nodular and/or heterogeneous enhancement on dynamic sequences and delayed T1 after gadolinium injection.
  • Minor complications occurred with fever, local pain, and pleural and peritoneal effusion. In one case a major complication occurred, with a hepatic abscess, 4 weeks after the procedure in a cirrhotic patient.
  • On control MRI, complete necrosis was obtained in metastases:
    • Tumor < 25 mm: 100 % of cases
    • 25 mm < Tumor< 35 mm: 76 % of cases
    • Tumor> 35 mm: 42 % of cases
      (average: 2.5 sessions and 3.7 cm diameter).
  • On control MRI, complete necrosis was obtained in HCC:
    • Tumor < 25 mm: 100 % of cases
    • 25 mm < Tumor< 35 mm: 77 % of cases
    • Tumor> 35 mm: 61 % of cases
      (Average: 1.9 sessions and 4.3 cm diameter)