CH 24 Flashcards
The fetal head and brain
Agenesis or hypoplasia of the cerebellar vermis results in what cerebral malformation?
Dandy-Walker Malformation
All of the following are midline brain structures except:
Lobes of the thalamus
All of the following are sonographic features of alobar holoprosencephaly except:
Dorsal cyst
All of the following are sonographic findings of Arnold-Chiari 2 malformation except:
- enlarged massa intermedia
- hydrocephalus
- obliteration of the cisterna magna
- strawberry sign
Strawberry sign
The anechoic midline brain structure located between the frontal horns of the lateral ventricles is the:
Cavum septum pellucidum
Atypical facial features are most commonly associated with what cerebral abnormality listed?
Holoprosencephaly
The band of tissue that allows communication between the right and left cerebral hemispheres is the:
Corpus callosum
The choroid plexus cyst could be associated with an increase risk of:
Trisomy 18
The cisterna magna should not exceed what measurement in the transcerebellar plane?
10 mm
A cloverleaf-shaped skull is related to:
Thanatophoric dysplasia
The condition in which the frontal horns are small and the occipital horns are enlarged is referred to as:
Copocephaly
The dangling choroid sign is synonymous with:
Ventriculomegaly
The development of fluid-filled cleft within the cerebrum is consistent with:
Schizencephaly
The double fold of dura mater used to divide the cerebral hemispheres is the:
Falx cerebri
Elevation of the tentorium and an enlarged cisterns magna that communicates with a dilated fourth ventricle is consistent with:
Dandy-Walker Malformation
Following an intracranial hemorrhage, a cyst is noted within the cerebrum that communicates with the lateral ventricle. This is referred to as:
Porencephaly
The fourth ventricle is located:
Anterior to the cerebellar vermis
The interthalmic adhesion (massa intermedia) passes through the:
Third ventricle
The lack of sulk within the fetal cerebrum is a reliable indicator of:
Lissencephaly
A lemon-shaped skull is related to:
Spina bifida, Arnold-Chiari 2 malformation, and thanatophoric dysplasia
The most accurate measurement at estimating gestational age from the list below is:
Head circumference
The most common cause of hydrocephalus in utero is:
Aqueductal stenosis
The most server form of holoprosencephaly is:
Alobar
The sonographic finding of a fluid-filled cranium with absence of cerebral tissue is consistent with:
Hydrancephaly
A strawberry-shaped skull is commonly associated with:
Trisomy 18
The structure located between the two lobes of the cerebellum is the:
Cerebellar vermis
The “sunburst” of the cerebral sulk is a sonographic finding of:
Agenesis of the corpus callosum
The third ventricle communicates with the fourth ventricle at the:
Aqueduct of Sylvius
The third ventricle is located:
Between the two lobes of the thalamus
What chromosomal aberration is most often associated with holoprosencephaly?
Trisomy 13
