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Radiology, Vol 180, 799-801, Copyright © 1991 by Radiological Society of North America

ARTICLES

Fetal cisterna magna septa: a normal anatomic finding

RK Knutzon, JP McGahan, MS Salamat and WE Brant
Department of Radiology, University of California, Davis, Medical Center.

A linear hyperechoic structure in the cisterna magna, previously described as the straight sinus, was investigated during routine obstetric ultrasound (US) examination. One hundred three fetal US examinations were performed to determine the prevalence and appearance of this finding. Also, US water-bath examination of 18 fixed postmortem specimens and fetuses was performed, and results were correlated with those of gross and microscopic examination of the fetal brain. The structure was identified in 95 (92%) prenatal examinations between 15 and 38 menstrual weeks. It was located posteriorly between the cerebellar hemispheres in the cisterna magna. In those 95 cases in which it was identified, it appeared as a single echogenic line in 31 cases (33%), as two echogenic lines in 47 (49%), or as three or more lines in 17 (18%). When two echogenic lines were identified, they appeared "cystlike" in 17 (18%) of the 95 examinations. Correlation of the gross and histologic findings demonstrated these lines to represent normal subarachnoid septa rather than the straight sinus.


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 J Ultrasound MedHome page
A. J. Robinson and R. Goldstein
The Cisterna Magna Septa: Vestigial Remnants of Blake's Pouch and a Potential New Marker for Normal Development of the Rhombencephalon
J. Ultrasound Med., January 1, 2007; 26(1): 83 - 95.
[Abstract] [Full Text] [PDF]


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