Penny OB/GYN Ch.24 Fetal head and Brain
The cisterna magna should not exceed what measurement in the transcerebellar plane?
10 mm
what structure does the posterior fossa cyst associated with dandy walker malformation (DWM) communicate?
4th ventricle
The "sunburst" of the cerebral sulk is a sonographic finding of:
Agenesis of the corpus callosum
The most server form of holoprosencephaly is:
Alobar
The fourth ventricle is located:
Anterior to the cerebellar vermis
The third ventricle communicates with the fourth ventricle at the:
Aqueduct of Sylvius
The most common cause of hydrocephalus in utero is:
Aqueductal stenosis
A lemon-shaped skull is related to:
Arnold-Chiari II malformation
The third ventricle is located:
Between the two lobes of the thalamus
which typically will also be absent with agenesis of the corpus collosum?
CSP-Cavum Septum Pellucidum
The anechoic midline brain structure located between the frontal horns of the lateral ventricles is the:
Cavum septum pellucidum
The structure located between the two lobes of the cerebellum is the:
Cerebellar vermis
The condition in which the frontal horns are small and the occipital horns are enlarged is referred to as:
Copocephaly
The band of tissue that allows communication between the right and left cerebral hemispheres is the:
Corpus callosum
Agenesis or hypoplasia of the cerebellar vermis results in what cerebral malformation?
Dandy-Walker Malformation
All of the following are sonographic features of alobar holoprosencephaly except:
Dorsal cyst
The double fold of dura mater used to divide the cerebral hemispheres is the:
Falx cerebri
The most accurate measurement at estimating gestational age from the list below is: bpd hc transcerebellar measurement lateral ventricle
Head circumference
Atypical facial features are most commonly associated with what cerebral abnormality listed?
Holoprosencephaly
The sonographic finding of a fluid-filled cranium with absence of cerebral tissue is consistent with:
Hydrancephaly
which is located on both sides of the midline
Lateral ventricles
The lack of sulk within the fetal cerebrum is a reliable indicator of:
Lissencephaly
Following an intracranial hemorrhage, a cyst is noted within the cerebrum that communicates with the lateral ventricle. This is referred to as:
Porencephaly
The development of fluid-filled cleft within the cerebrum is consistent with:
Schizencephaly
All of the following are sonographic findings of Arnold-Chiari 2 malformation except:
Strawberry sign is not the ones listed below are: enlarged mass intermedia hydrocephalus obliteration of the cisterna magna
A cloverleaf-shaped skull is related to:
Thanatophoric dysplasia
The interthalmic adhesion (massa intermedia) passes through the:
Third ventricle
What chromosomal aberration is most often associated with holoprosencephaly?
Trisomy 13
A strawberry-shaped skull is commonly associated with:
Trisomy 18
The choroid plexus cyst could be associated with an increase risk of:
Trisomy 18
abscence of the skull
acrania
which of the following is a genetic disorder that includes craniosynostosis, midline facial hypoplasia, and syndactyly
apert syndrome
enlargement of the frontal horns and narrowing of the occipital horns is termed
colpocephaly
which of the following would be the most likely fetal cranial finding with TORCH infections?
intracranial calcifications
a cisterna magna that measures 15mm and a normal appearing cerebellum is most likely
mega cisterna magna
a normal shaped skull is termed
mesocephaly
What fetal suture is located within the frontal bone along the midline of the forehead?
metopic suture
dangling choroid sign is associated with
ventriculomegaly