Diagnostic Ultrasound - Abdomen and Pelvis

Cervix
CHANGES OF CERVIX DURING PREGNANCY
Anatomy: Pelvis
Nabothian cyst
Diastolic notch
Uterine arteries
Mucus plug
Acoustic shadows from edges
(Top) Transverse transvaginal ultrasound shows spectral waveform of the uterine artery at the lateral margin of a non-pregnant cervix.
There is typical high-resistance flow with a diastolic notch. In normal women, the Doppler waveform usually demonstrates a highresistance
pattern except in late secretory phase. (Middle) As softening of the cervix due to engorgement with blood becomes apparent
by 6 weeks after conception, the changes can be reflected in the uterine artery, with high-velocity, low-resistance flow seen on this
transabdominal spectral Doppler examination. (Bottom) Transverse transabdominal ultrasound shows the typical thick and echogenic
mucus plug in a pregnant cervix casting dense shadows from its edges.
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