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Which one of the following anomalies is caused by an alkaline phosphatase deficiency?

A large cystic hygroma, hydrops, and coarctation of the aorta may be seen in a fetus with which one of the following?

A cystic growth of the common bile duct is ______________.

Which one of the following statements about twin-to-twin transfusion syndrome is true?

Multiple tiny clusters of grapelike echoes within the uterine cavity best describes which one of the following?

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.