Diagnostic ultrasound ( PDFDrive )

1488 PART IV Obstetric and Fetal Sonography
A
B
C
D
E
F
FIG. 43.35 Vasa Previa. (A) Transabdominal color Doppler demonstrating vessels overlying the internal cervical os. (B) Transvaginal color
Doppler demonstrating a vessel overlying the internal cervical os. The fetal cranium is shown in the lower portion of the image. (C) Color and
pulsed Doppler demonstrating a fetal artery overlying the internal cervical os consistent with a vasa previa. (D) Color Doppler sonogram demonstrating
a normal placental umbilical cord insertion. (E) Gray-scale sonogram of the same patient in D demonstrating an apparently normal image of the
internal cervical os. (F) Color and pulsed Doppler demonstrating a placental vessel overlying the internal cervical os consistent with a vasa previa.
Placental vessels can emanate from the placental disc even in those with normal umbilical cord insertions. See also Video 43.17.