OB Module Final Exam

Which structural abnormality is a feature of Pentalogy of Cantrell?

Ectopia cordis

What will be dilated with aqueductal stenosis?

3rd ventricle and lateral ventricles

What is the most anterior cardiac chamber?

Right ventricle

What is Meckel-Gruber syndrome?

Euploid fetus with an occipital cephalocele and polycystic kidneys

Concern for Ebsteins anomaly is suggested when there is non-normalization of what anatomical structure?

Tricuspid valve

What condition is most likely demonstrated in this image?

Congenital Pulmonary Airway Malformation

What is the first structure visualized within a normal gestational sac?

Secondary yolk sac

How many chromosomes does each euploid cell contain?

46

What is the image documenting?

Ventriculomegaly

When is the midgut herniation normally visualized?

11 weeks

In which scenario is clinodactyly most often present?

Trisomy 18

Which lab value is most likely to be consistent in a Down syndrome fetus?

Low AFP

What is the arrow indicating in this image?

Diaphragm

What is Arnold-Chiari malformation?

Abnormal posterior fossa including downward displacement of the cerebellum and loss of cisterna magna

Visualization of what fetal structure aids in normalizing renal function?

Bladder

What is the definition of dolichocephaly?

Flattened head shape and cephalic index <0.75

How many placentas would be present in a monochorionic/diamniotic gestation?

1

Sonographic detection of rockerbottom feet most often indicates which aneuploid?

Edwards syndrome

What is abnormal in this view of the fetal profile?

Absent nasal bone and microcephaly

What disease is defined as underossification of the skeleton characterized by rib fractures and a compressible skull?

Osteogenesis imperfecta

What intracranial defect is often present with Patau syndrome?

Holoprosencephaly

What type of monozygotic twinning has the lowest likelihood of discordant growth?

Dichorionic/Diamniotic

What is the normal cardiac axis termed?

Levocardia

Based on these images, how is the fetal situs interpreted?

Vertex lie, normal situs solitus

What defect can be ruled out by this normal view?

Gastroschisis

What term describes absent cranium and exposure of the fetal cerebrum?

Exencephaly

How can Dandy Walker malformation be distinguished form mega cisterna magna?

Dilated 4th ventricle

What is responsible for hCG production?

Trophoblast

What is this associated with this finding?

Myelomeningocele

In the normal first trimester, the hCG levels double every 48 hours until what gestational week?

9 weeks

What is the diagnosis?

Ectopic pregnancy

What produces cerebral spinal fluid?

Choroid plexus

Fetal bones normally demonstrate what artifact?

Shadowing

What is lissencephaly?

Agyria

What is the most common site for an ectopic pregnancy?

Ampulla

What process is demonstrated in this image taken at 10 weeks?

Midgut herniation

Which of the following defects below is considered a symmetrical anomaly?

Omphalocele

The findings below are discovered during an obstetrical survey. What is the most appropriate action to take?

Evaluate for supplying vessel

What type of twin gestation is seen in the image?

Dichorionic/Diamniotic

What syndrome is a proboscis associated with?

Patau