Posterior fossa and vermian morphometry in the characterization of fetal cerebellar abnormalities: a prospective three-dimensional ultrasound study

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
D Paladini, P Volpe

Abstract

To assess whether, by applying a predefined set of morphometric measurements to the posterior fossa and the cerebellar vermis, it is possible to detect and quantify the following parameters, which represent key features of abnormalities of the vermis and posterior fossa: 1) upward rotation of the vermis; 2) upward displacement of the tentorium; 3) underdevelopment of the vermis. Also to assess, in a small subset of cases, the correlation between ultrasound and magnetic resonance imaging (MRI) in the measurement of these three parameters. This was a prospective observational trial. The study population included 51 normal fetuses and 20 abnormal fetuses with Dandy-Walker malformation (n = 5), Dandy-Walker variant (n = 8) or megacisterna magna (n = 7). Three-dimensional (3D) ultrasound volumes of the fetal head were acquired from the posterior fontanelle or the posterior part of the sagittal suture and processed offline with dedicated software. The following parameters were analyzed: tentorovermian angle; tentoroclivus angle; clivovermian angle; vermian diameter/biparietal diameter x 100 ratio (VD/BPD ratio). In seven cases, MRI performed on the same day as sonography was available for comparison. Non-parametric statistics were us...Continue Reading

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