Intraoperative B-mode ultrasound monitoring of the tip of bipolar forceps during umbilical cord diathermy.This was a case of selective fetal growth restriction type II (reversed end-diastolic flow in the umbilical artery of the twin with growth restriction) in monochorionic 20-week twins undergoing umbilical cord occlusion for the purpose of selective termination. The umbilical cord to be treated was placed between 2 condenser plates (arrow), so that the highest temperature would be concentrated.