CH 24

Question 1

Agenesis or hypoplasia of the cerebellar vermis results in what cerebral malformation?

Answer 1

Dandy-Walker Malformation

Question 2

All of the following are midline brain structures except:

Answer 2

Lobes of the thalamus

Question 3

All of the following are sonographic features of alobar holoprosencephaly except:

Answer 3

Dorsal cyst

Question 4

All of the following are sonographic findings of Arnold-Chiari 2 malformation except:

• enlarged massa intermedia
• hydrocephalus
• obliteration of the cisterna magna
• strawberry sign

Answer 4

Strawberry sign

Question 5

The anechoic midline brain structure located between the frontal horns of the lateral ventricles is the:

Answer 5

Cavum septum pellucidum

Question 6

Atypical facial features are most commonly associated with what cerebral abnormality listed?

Answer 6

Holoprosencephaly

Question 7

The band of tissue that allows communication between the right and left cerebral hemispheres is the:

Answer 7

Corpus callosum

Question 8

The choroid plexus cyst could be associated with an increase risk of:

Answer 8

Trisomy 18

Question 9

The cisterna magna should not exceed what measurement in the transcerebellar plane?

Answer 9

10 mm

Question 10

A cloverleaf-shaped skull is related to:

Answer 10

Thanatophoric dysplasia

Question 11

The condition in which the frontal horns are small and the occipital horns are enlarged is referred to as:

Answer 11

Copocephaly

Question 12

The dangling choroid sign is synonymous with:

Answer 12

Ventriculomegaly

Question 13

The development of fluid-filled cleft within the cerebrum is consistent with:

Answer 13

Schizencephaly

Question 14

The double fold of dura mater used to divide the cerebral hemispheres is the:

Answer 14

Falx cerebri

Question 15

Elevation of the tentorium and an enlarged cisterns magna that communicates with a dilated fourth ventricle is consistent with:

Answer 15

Dandy-Walker Malformation

Question 16

Following an intracranial hemorrhage, a cyst is noted within the cerebrum that communicates with the lateral ventricle. This is referred to as:

Answer 16

Porencephaly

Question 17

The fourth ventricle is located:

Answer 17

Anterior to the cerebellar vermis

Question 18

The interthalmic adhesion (massa intermedia) passes through the:

Answer 18

Third ventricle

Question 19

The lack of sulk within the fetal cerebrum is a reliable indicator of:

Answer 19

Lissencephaly

Question 20

A lemon-shaped skull is related to:

Answer 20

Spina bifida, Arnold-Chiari 2 malformation, and thanatophoric dysplasia

Question 21

The most accurate measurement at estimating gestational age from the list below is:

Answer 21

Head circumference

Question 22

The most common cause of hydrocephalus in utero is:

Answer 22

Aqueductal stenosis

Question 23

The most server form of holoprosencephaly is:

Answer 23

Alobar

Question 24

The sonographic finding of a fluid-filled cranium with absence of cerebral tissue is consistent with:

Answer 24

Hydrancephaly

Question 25

A strawberry-shaped skull is commonly associated with:

Answer 25

Trisomy 18

Question 26

The structure located between the two lobes of the cerebellum is the:

Answer 26

Cerebellar vermis

Question 27

The "sunburst" of the cerebral sulk is a sonographic finding of:

Answer 27

Agenesis of the corpus callosum

Question 28

The third ventricle communicates with the fourth ventricle at the:

Answer 28

Aqueduct of Sylvius

Question 29

The third ventricle is located:

Answer 29

Between the two lobes of the thalamus

Question 30

What chromosomal aberration is most often associated with holoprosencephaly?

Answer 30

Trisomy 13