Chapter 24-The Fetal Head and Brain
The cisterna magna should not exceed __________ in the transcerebellar plane
10mm
The "Sunburst" of the cerebral sulci is a sonographic finding of
Agenesis of the corpus callosum
A genetic disorder that includes craniosynostosis, midline facial hypoplasia, and syndactyly
Apert Syndrome
The third ventricle communicates with the fourth ventricle at the
Aqueduct of Sylvius
A lemon-shaped skull is related to
Arnold-Chiari II malformation
Normally located within the midline of the fetal brain
CSP, Third ventricle, and Falx cerebri
The structure located between the two lobes of the cerebellum
Cerebellar vermis
The condition in which the frontal horns are small and the occipital horns are enlarged is referred to as
Colpocephaly
Cerebral malformation that is a result of agenesis of hypoplasia of the cerebral vermis
DWM
Sonographic findings of Arnold-Chiari II malformation
Enlarged massa intermedia, Hydrocephalus, and Obliteration of the cisterna magna
The double fold of dura mater that divides the cerebral hemisphere is the
Falx Cerebri
Should be included in the correct level for an HC measurement
Falx Cerebri, Thalamus, and CSP
The most accurate measurement for estimating gestational age
Head Circumference
Sonographic finding of a fluid-filled cranium with absence of cerebral tissue is consistent with
Hydranencephaly
The most likely fetal cranial findings with TORCH Infections
Intracranial calcifications
The lack of sulci within the fetal cerebellum is a reliable indicator of
Lissencephaly
A cisterna magna that measures 15mm and a normal appearing cerebellum is most likely
Mega Cisterna Magna
Normal Shaped Skull term
Mesocephaly
Fetal suture located within the frontal bone along the midline of the forehead
Metatopic suture
The development of fluid-filled cleft within the cerebrum is consistent with
Schizencephaly
A cloverleaf-shaped skull is related to
Thanatophoric Dysplasia
The inerthalamic adhesion (massa intermedia) passes through the
Third Ventricle
Chromosomal aberration 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
Dangling Choroid sign is associated with
Ventriculomegaly
Absence of the skull
acrania
The fourth ventricle is located
anterior to the cerebral vermis
The most common cause of hydrocephalus
aqueductal stenosis
The third ventricle is located
between the two lobes of the thalamus
Enlargement of the frontal horns and narrowing of the occipital horns
colpocephaly
Sonographic features of alobar holoprosencephaly
cyclopia, monoventricle, and a fused thalamus
Cerebral abnormality that atypical facial features are most commonly associated with
holoprosencephaly
Not normally located within the midline of the fetal brain
lobes of the thalamus
Lateral Ventricles are located
on both sides of the midline
Following an intracranial hemmorhage, a cyst is noted within the cerebrum that communicated with the lateral ventricle. This is referred to as
porencephaly
Alobar holoprosencephaly is the most
severe form of holoprosencephaly
The anechoic midline brain structure located between the frontal horns of the lateral ventricles is
the CSP
The band of tissue that allows communication between the right and left cerebral hemispheres is
the Corpus Collosum
The Posterior Fossa cyst associated with DWM communicates with
the Fourth Ventricle
CSP will also typically be absent with agenesis of
the corpus collosum
