case_images: PMC8383637_01
case_images: The ultrasonography findings of a hyper-coiled umbilical cord in case 1.
case_images: jmc-12-001-g001.jpg
case_images: PMC8383637_01_jmc-12-001-g001.jpg
case_images: F1
case_images: However, a hyper-coiled cord was revealed based on the antenatal coiling index which was 0.84 (1/length of one cycle (cm)) (Fig. 1).
case_images: PMC8383637_02
case_images: The ultrasonography findings of hyper-coiled umbilical cord in case 2.
case_images: jmc-12-001-g002.jpg
case_images: PMC8383637_02_jmc-12-001-g002.jpg
case_images: F2
case_images: On ultrasound assessment at 20 + 1 weeks' gestation in our hospital, the estimated fetal weight was 210 g, which was - 2.0 standard deviation (SD) based on the Japanese standard, a hyper-coiled cord was detected by the coiling index of 0.6, and marginal cord insertion of the placenta was revealed (Fig. 2).
case_images: (a) The reversed wave of ductus venosus before the admission of case 2. (b) The umbilical venous pulsation before the admission of case 2.
case_images: jmc-12-001-g003.jpg
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case_images: F3
case_images: Ultrasound Doppler assessment revealed the reversed wave of ductus venosus and the pulsation of umbilical venous blood flow (Fig. 3a, b).
case_images: (a) The reversed wave of ductus venosus after the admission of case 2. (b) The umbilical venous pulsation after the admission of case 2.
case_images: jmc-12-001-g004.jpg
case_images: PMC8383637_02_jmc-12-001-g004.jpg
case_images: F4
case_images: The Doppler assessment of both the ductus venosus and umbilical venous flow also improved (Fig. 4a, b).