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An ectopic pregnancy most commonly occurs in which one of the following structures?

A sonographic demonstration of the normal esophagus in the second and third trimesters appears as a _________________.

The normal AP diameter of the renal pelvis at 20 weeks’ gestation should not exceed _____ mm.

The presence of umbilical vessels crossing the internal os of the cervix is called which one of the following?

Select the structure that is the major source of amniotic fluid production in early pregnancy.

Functioning endometrial tissue is present outside of the uterus in which one of the following common conditions?

Which one of the following statements about the embryonic and fetal heart rate is false?

Beckwith-Wiedemann syndrome includes all of the following except:

The rupture of the amnion that leads to entrapment or entanglement of the fetal parts by the “sticky” chorion is called which one of the following?

Common anomalies coexisting with a gastroschisis include which one of the following?