Application of contrast-enhanced ultrasonography during radiofrequency ablation for renal tumors / 中华超声影像学杂志

ABSTRACT

Objective To assess the intraoperative efficacy of contrast-enhanced ultrasonography (CEUS) in the radiofrequency ablation (RFA) of renal tumors.Methods RFA was performed on 110 renal tumors (size range1.5-8.6 cm,49 located in the left,55 right and 3 bilateral) in 107 selected patients.Conventional tumor biopsy was conducted for pathological diagnosis using 18G biopsy needle after RFA.CEUS was performed in all patients before,during and after RFA to assess the necrotic area.Once suspicious residual lession was discovered by CEUS,another round of RFA was taken immediately.Initial follow-up enhanced CT and CEUS was performed seven days after the procedure,with subsequent CEUS and enhanced CT after one month,three months,and six months to assess the necrotic area.Technical success was defined as elimination of areas that enhanced at imaging within the entire tumor.Results With CEUS performed during RFA,110 tumors (100％) were successfully ablated during one operation.Of these,five tumors was subjected to additional RFA treatment for the suspicious residual lesion detected by CEUS right after initial RFA.Elimination of areas covered the entire tumor after the second RFA.No residual or recurrence tumors was confirmed by both enhanced CT and CEUS during follow-up.All patients survived in the follow-up phase which ranged from 3 to 18 months(mean 11 months).Conclusions With the application of intraoperative CEUS,there were less residual tumors after RFA.