The fetal cisterna magna.

Mahony, Barry S.; Callen, P W; Filly, Roy A.; Hoddick, W

doi:10.1148/radiology.153.3.6387792

Cited by 71 publications

(35 citation statements)

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“…30 Previous studies have reported this definition to be inaccurate, and it has been shown to vary with gestational age. 31,32 The cisterna magna is a fluid-filled space that is normally continuous with the subarachnoid space of the entire PF, between the foramen magnum and the tentorium cerebelli.…”

Section: Discussionmentioning

confidence: 99%

Normal Fetal Posterior Fossa in MR Imaging: New Biometric Data and Possible Clinical Significance

Ber¹,

Bar‐Yosef²,

Hoffmann

et al. 2015

AJNR Am J Neuroradiol

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Section: Discussionmentioning

confidence: 99%

Normal Fetal Posterior Fossa in MR Imaging: New Biometric Data and Possible Clinical Significance

Ber¹,

Bar‐Yosef²,

Hoffmann

et al. 2015

AJNR Am J Neuroradiol

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“…The size of the cisterna magna can appear to be enlarged as an artifact of increasing the angle of the transducer inclination [15]. The space caudal to the cerebellar tonsils can be misinterpreted as vermian hypoplasia.…”

Section: Discussionmentioning

confidence: 99%

Dandy-Walker Malformation: A Review of 78 Cases Diagnosed by Prenatal Sonography

Has¹,

Ermiş²,

Yüksel³

et al. 2004

Fetal Diagn Ther

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Objective: The purpose of this study was to determine the associated abnormalities and clinical outcomes of fetuses with Dandy-Walker malformations. Methods: Sonograms and medical reports of 78 cases were reviewed and information regarding each outcome was collected from autopsy records, hospital charts and specialists caring for the surviving infants. Results: We identified 64 fetuses with classic Dandy-Walker malformation (DW) and 14 fetuses with Dandy-Walker variant (DWV). A high proportion (44.8%) of the parents were consanguineous. The spectrum and proportion of central nervous system (67.1 vs. 71.4%; p = 1.0) and other malformations (43.7 vs. 64.2%; p = 0.57) associated with DW and DWV were similar. Chromosome abnormalities were found in 9 of the 51 (17.6%) fetuses that underwent karyotype analysis. Only 4 of 64 (6.2%) DW and 3 of 14 (21.4%) DWV infants survived (p 0.14), and all surviving infants with DW or DWV had neurological disorders. Conclusions: DW and DWV cases show so many similarities that a clear-cut distinction is difficult. There was no significant difference in the spectrum of associated anomalies and postnatal prognosis between DW and DWV cases.

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“…Enlargement of the CM (ECM), also referred to as mega CM, has historically been defined as an anteroposterior CM measurement >10 mm [3,4]. Enlargement may represent normal anatomical variation or may be pathological due to either direct or passive ECM.…”

Section: Introductionmentioning

confidence: 99%

“…The original definition of ECM in the fetal period as a diameter >10 mm is based on a small number of observations from 219 patients [3]; other studies have also evaluated relatively small numbers of patients [7], including studies that have evaluated the use of magnetic resonance imaging [8]. Prior evaluation of the CM through pregnancy has demonstrated an increase in the CM diameter with advancing gestation [9], therefore using a single value as a cut-off for determining enlargement might not be the most appropriate approach but in clinical practice the 10-mm cut-off remains the standard determinant of an enlarged CM at all gestations.…”

Section: Introductionmentioning

confidence: 99%

Reassessment of the Normal Fetal Cisterna Magna during Gestation and an Alternative Approach to the Definition of Cisterna Magna Dilatation

Brown¹

2013

Fetal Diagn Ther

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Introduction: Cisterna magna (CM) measurement constitutes part of the sonographic assessment of the posterior fossa. CM enlargement (ECM) is defined as a measurement exceeding 10 mm, although it has previously been noted that the CM varies in size with gestation. Existing data do not appear to reflect observations regarding CM biometry within our population and this study was therefore undertaken in order to re-evaluate CM biometry. Materials and Methods: Data from 4,750 normal pregnancies between 15 and 32 weeks of gestation were collected and used to construct a reference range for the CM. Results: Regression analysis was used to model CM across gestational age and thereby define the upper limits for normal CM measurements across gestation. The CM increases with gestation. These data suggest that a 10-mm cut-off underestimates ECM, notably in the gestational age period below 24 weeks, whilst overestimating isolated ECM beyond this. Differences in CM measurements between genders were confirmed (p < 0.0001). Conclusions: Defining ECM based upon a cut-off of 10 mm across all gestations may be inappropriate given the variation observed with gestational age. More accurate identification of fetuses with, in particular, isolated ECM may facilitate more precise evaluation of the clinical significance of this finding.

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The fetal cisterna magna.

Cited by 71 publications

References 0 publications

Normal Fetal Posterior Fossa in MR Imaging: New Biometric Data and Possible Clinical Significance

Normal Fetal Posterior Fossa in MR Imaging: New Biometric Data and Possible Clinical Significance

Dandy-Walker Malformation: A Review of 78 Cases Diagnosed by Prenatal Sonography

Reassessment of the Normal Fetal Cisterna Magna during Gestation and an Alternative Approach to the Definition of Cisterna Magna Dilatation

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