The clivus-supraocciput angle: a useful measurement to evaluate the shape and size of the fetal posterior fossa and to diagnose Chiari II malformation.
Ultrasound Obstet Gynecol
; 18(2): 146-9, 2001 Aug.
Article
in En
| MEDLINE
| ID: mdl-11529995
ABSTRACT
OBJECTIVE:
To obtain a nomogram of the clivus-supraocciput angle as a basis for the diagnosis of Chiari II malformation in fetuses with ventriculomegaly.METHODS:
A cross-sectional study was undertaken on 310 normal pregnant women of 16-34 weeks' gestation. A mid-sagittal section of the fetal skull was obtained and the angle between the clivus and the supraocciput was measured. Forty-four fetuses with ventriculomegaly due to various causes (13 Chiari II malformation, 12 dysgenesis of the corpus callosum, 7 aqueductal stenosis, 6 borderline ventriculomegaly, 3 Dandy-Walker malformation, 2 porencephaly, 1 schizencephaly) were also included in the study and the values of the angle found in the pathological cases were compared with those found in the normal population.RESULTS:
The clivus-supraocciput angle did not change during gestation and was almost constant with an average value of 79.3 +/- 6 degrees. All cases of Chiari II malformation showed a value below the 5th centile of our nomogram.CONCLUSIONS:
The evaluation of the posterior fossa and particularly the measurement of the clivus-supraocciput angle is a useful parameter to differentiate the various causes of fetal ventriculomegaly and particularly to recognize Chiari II malformation.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Arnold-Chiari Malformation
/
Cranial Fossa, Posterior
Type of study:
Diagnostic_studies
/
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limits:
Adolescent
/
Adult
/
Humans
Language:
En
Journal:
Ultrasound Obstet Gynecol
Journal subject:
DIAGNOSTICO POR IMAGEM
/
GINECOLOGIA
/
OBSTETRICIA
Year:
2001
Document type:
Article
Affiliation country:
Italy
Publication country:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
/
UK
/
UNITED KINGDOM