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What percentage of cystic hygromas is associated with chromosomal anomalies?

Normal interventricular septal thickness during the third trimester should not exceed _______ mm.

Blood flow in the fetus communicates between the aorta and pulmonary arteries via which one of the following?

Limb–body wall defects are more common ______:

A gestational age of 20 weeks would show a normal aortic measurement of ___ mm.

Which one of the following types of imaging is used to evaluate cardiac motion?

Which one of the following anomalies is associated with micromelia and a “hitchhiker thumb?”

Kidneys should be sonographically documented in all fetuses beginning at ______ weeks’ gestation.

A normal amniotic fluid volume cannot exclude renal agenesis before _____ weeks’ gestation.

Fusion of the lower extremities is associated with which one of the following?