Rotation of the vermis as a cause of enlarged cisterna magna on prenatal imaging

Zalel, Yaron; Gilboa, Yinon; Gabis, Lidia V.; Ben-Sira, Liat; Hoffman, Chen; Wiener, Yifat; Achiron, Reuven

doi:10.1002/uog.2768

Cited by 41 publications

(35 citation statements)

References 21 publications

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“…Indeed, we found that in the sagittal plane, the vermis was very well delineated, and its longitudinal diameter could be measured. 3,17 This view may sometimes be difficult to obtain. Although in a vertex presentation, the vaginal approach can improve brain visualization, when the fetus lies in a breech presentation, it can require considerable time and expertise to obtain an adequate sagittal view.…”

Section: Discussionmentioning

confidence: 99%

Three‐Dimensional Ultrasonography of the Fetal Vermis at 18 to 26 Weeks' Gestation

Zalel

Yagel

Achiron

et al. 2009

J of Ultrasound Medicine

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Objective. The purpose of this study was to establish the normality of the fetal vermis, ie, the time of appearance of the primary fissure, as well as its measurements between 18 and 26 weeks' gestation, using 3-dimensional (3D) ultrasonography. Methods. A prospective cross-sectional study of normal singleton pregnancies was conducted. Examinations were performed with high-resolution transabdominal ultrasonography using the axial plane in 173 fetuses between 18 and 26 weeks' gestation. Postprocessing measurements of the fetal vermis were done with 4-dimensional software using static volume contrast imaging and tomographic ultrasound imaging in the C-plane. Detection of the primary fissure was evaluated in all cases, and the time of appearance was documented. Results. Adequate vermis measurements were obtained in 173 fetuses. Vermian length as a function of gestational age was expressed by regression equations, and the correlation coefficients were found to be highly statistically significant (P < .001). The normal mean ± 2 SD for each gestational week was defined. The primary fissure was observed at 24 weeks' gestation in all cases, at 22 weeks in 94% of cases, and as early as 18 weeks in 40%. Conclusions. This 3D study documents the appearance of the primary fissure and presents the normal range of vermian measurements, confirming normal development of the fetal vermis starting as early as 18 weeks' gestation. It also shows an easy method for visualizing the vermis with 3D ultrasonography at every gestational week regardless of fetal presentation.

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Section: Discussionmentioning

confidence: 99%

Three‐Dimensional Ultrasonography of the Fetal Vermis at 18 to 26 Weeks' Gestation

Zalel

Yagel

Achiron

et al. 2009

J of Ultrasound Medicine

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“…However, Kölble et al [14] found normal karyotypes in all 7 DWM cases tested. Several studies support the theory that isolated MCM malformation has a favourable prognosis of normal developmental outcome [13,17,18], and isolated DWC fetuses can expect a good prognosis in up to 67% [13]. Knowledge of the long-term outcome on PBP is limited to 6 case studies of adults diagnosed after presenting with hydrocephaly [19].…”

Section: Introductionmentioning

confidence: 99%

Perinatal and Short-Term Neonatal Outcomes of Posterior Fossa Anomalies

Ghali

Reidy²,

Fink³

et al. 2013

Fetal Diagn Ther

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Objective: To describe the perinatal and neonatal outcomes for fetuses with posterior fossa (PF) anomalies - mega-cisterna magna (MCM), persistent Blake's pouch (PBP) or the Dandy-Walker continuum (DWC) - using a new classification. Methods: 46 cases with PF anomaly diagnosed on ultrasound (US) between 16 and 28 weeks' gestation were included. The images were reviewed and classified as one of the following: MCM, PBP or DWC. Outcomes were obtained from patient records. Results: 30 cases with DWC, 6 with MCM, and 10 with PBP were identified. Associated anomalies were present in all groups, but more frequent in DWC. Agenesis of the corpus callosum and ventriculomegaly were more common in DWC than in MCM or PBP. Only fetuses with DWC were found to have chromosomal abnormalities. Perinatal outcomes differed significantly, with terminations of pregnancy more frequent in DWC. In the immediate postnatal period, infants with DWC had worse outcomes than those with MCM and PBP. Across all groups, those with associated anomalies had worse outcomes than those with an isolated PF anomaly. Conclusion: Infants antenatally diagnosed with DWC had worse perinatal and short-term neonatal outcomes than those with MCM or PBP. Those with associated anomalies had uniformly poorer outcomes than those with isolated anomalies.

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“…2 Fetal posterior fossa anomalies range from benign asymptomatic conditions to severe abnormalities associated with neurologic impairment. [3][4][5][6] The most frequent of these anomalies, Blakes pouch cyst, vermian hypoplasia, and Dandy-Walker malformation, have a similar imaging appearance 7,8 but different vermian biometry and, therefore, different prognoses. 9 Many anomalies of the posterior fossa can be depicted with sonography alone.…”

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confidence: 99%

Development of the Fetal Vermis: New Biometry Reference Data and Comparison of 3 Diagnostic Modalities-3D Ultrasound, 2D Ultrasound, and MR Imaging

Katorza

Bertucci²,

Perlman

et al. 2016

American Journal of Neuroradiology

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Rotation of the vermis as a cause of enlarged cisterna magna on prenatal imaging

Abstract: ABSTRACT

Cited by 41 publications

References 21 publications

Three‐Dimensional Ultrasonography of the Fetal Vermis at 18 to 26 Weeks' Gestation

Three‐Dimensional Ultrasonography of the Fetal Vermis at 18 to 26 Weeks' Gestation

Perinatal and Short-Term Neonatal Outcomes of Posterior Fossa Anomalies

Development of the Fetal Vermis: New Biometry Reference Data and Comparison of 3 Diagnostic Modalities-3D Ultrasound, 2D Ultrasound, and MR Imaging

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