Irrigated bipolar radiofrequency ablation provides acute transmurality after multiple ablations. However, total recovery of conduction occurred in 15% of the patients after 3 weeks. Repeated multiple ablations, possibly complemented by block validation, are suggested to help achieve durable transmurality with such technology.

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pain in this population of patients. They will also help in planning clinical trials to assess efficacy of different treatment methods including aggressive analgesic pain treatment in the early postoperative phase.

Oral communication abstractsunilocular-solid on ultrasound. Overall, maximum diameter was 300mm. 15 patients recurred once, and two patients recurred twice. Some patients still opted for a fertility-sparing approach to treat the recurrence. No recurrence progressed to cancer. 11 patients conceived. Conclusions: To date this is the largest nationwide cohort of BOTs. Our dataset highlights three important issues. First, the option of a fertility-sparing approach is crucial to women of fertility potential and should be offered as first choice to those patients who have either not started or completed a family. Second, our recurrence number has a negligible percentage of invasive recurrences when compared to results quoted in literature (for example, ROBOT study). We hypothesise that an ultrasound scan performed every 3 months at a follow-up appointment results in an earlier detection rate of borderline recurrence. This in turn leads to surgical treatment before invasive transformation. Third, the findings seem to confirm that a thorough ultrasonographic follow-up of BOT recurrence is safe and feasible. OC12.03 Comparison of clinical and ultrasound characteristics in lowand high-grade serous cancer