3.  The umbilical cord of a placenta from a preterm delivery is narrow and wrinkled. A 10-cm segment adjacent to the placental disc is flattened. Which of the following conditions is most likely associated with these changes?

  4.  A 35-year-old pregnant woman presents with fever, uterine tenderness, and leukocytosis. She delivers a male baby at 30-week gestation. Histologic examination of the placenta and amniotic sac reveals the changes shown in this picture. Which of the following is the most likely infectious agent of this condition?

  5.  Microscopic examination of a term placenta reveals a diffuse neutrophilic infiltration of villi and intervillous spaces, with scattered microabscesses. This histologic presentation is usually caused by:

  6.  The cause of villitis of unknown etiology (VUE) is in most cases due to:

  7.  Which of the following conditions results in the abnormalities of villous maturation illustrated in this picture?

  8.  A placenta is submitted for gross and histologic evaluation in a case of clinically diagnosed abruptio placentae. Which of the following microscopic findings is most compatible with this diagnosis?

  9.  In this photomicrograph, chorionic villi display a change that may be produced by chronic fetal–placental hypoxia. Which of the following is it?

10.  Which of the following types of multiple pregnancies is associated with the highest risk of twin-to-twin-transfusion syndrome?