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Figure 1
Transvaginal ultrasound without colour doppler did not reveal an abnormal image such as the placenta and vessels between the foetal head and internal cervical os (1A). A vessel was found between the foetal head and the internal cervical os by using colour doppler (1B). Using pulse doppler, the vessel showed foetal artery waveforms (1C).
Figure 2
Intraoperative findings before rupture of the amniotic membrane showed that foetal vessels were found in the exposed amniotic membrane (2A). A segment of the foetal vessels was meandering and running over the internal cervical os (2B). Both the placental position and the site of the umbilical cord insertion were above the low transverse incision scar (2C). In all photographs, the upper side of image was the side of the patient’s head.