If a single umbilical artery is seen, the sonographer should search for which one of the following?

Menarche may be defined as which one of the following?

Which one of the following abnormalities is described as the congenital absence of the cerebral hemispheres resulting from an occlusion of the internal carotid arteries?

All of the following are characteristics of thanatophoric dysplasia except:

Congenital anomalies associated with polyhydramnios include all of the following except:

Ventriculomegaly is defined as lateral ventricular enlargement measuring greater than ____ millimeters (mm).

Which one of the following is demonstrated if the division of one fertilized egg occurs 4 to 8 days after fertilization?

A specific diagnosis of a paraovarian cyst is possible only by:

Assessing amniotic fluid volume using the sum of four quadrants is called which one of the following?

The biparietal diameter (BPD) is the measurement of the fetal head at the level of which of the following structures?