The abnormality in this 18-week gestation is most suspicious for which chromosomal anomaly?  

Which of the following measurements is most widely used when determining gestational age in the second trimester?

Which of the following determines cervical competence?

What is considered the best protection to stop the spread of disease?

Which of the following should be assessed in a fetus presenting with a genitourinary abnormality?

Which of the following structures implants into the endometrium?

Which of the following abnormalities demonstrates a cranial defect?

The goal of intrauterine transfusion is:

Sonographic appearance of a normal small bowel during the second trimester is described as:

Intrauterine growth restriction most severely affects which fetal body organ?