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The fetal cisterna magna.

B S Mahony, P W Callen, R A Filly

    Radiology
    |December 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Routine antenatal ultrasounds assess the fetal cisterna magna. A prominent cisterna magna, without other posterior fossa abnormalities, is generally not clinically significant.

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    Area of Science:

    • Medical Imaging
    • Fetal Medicine
    • Neurosonography

    Background:

    • Antenatal sonography is a standard obstetric imaging tool.
    • The fetal cisterna magna is routinely visualized during obstetric ultrasounds.
    • Enlargement of the cisterna magna can suggest a congenital posterior fossa lesion.

    Purpose of the Study:

    • To establish standardized measurements for fetal cisterna magna depth.
    • To determine the typical size range of the fetal cisterna magna.
    • To assess the clinical significance of a prominent cisterna magna in fetuses.

    Main Methods:

    • Prospective collection of 219 antenatal sonograms.
    • Standardized midsagittal depth measurements of the cisterna magna.
    • Inclusion of fetuses at 15 or more menstrual weeks.

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    Main Results:

    • The mean cisterna magna depth measured 5 +/- 3 mm.
    • The maximum measured cisterna magna depth was 10 mm.
    • A prominent cisterna magna was found to be unlikely clinically significant when isolated.

    Conclusions:

    • Established normative data for fetal cisterna magna size.
    • Provided guidance on interpreting a prominent cisterna magna on antenatal ultrasound.
    • Reduced unnecessary concern for posterior fossa lesions when findings are isolated.