Two‐dimensional visualization and measurement of the fetal optic chiasm: improving counseling for antenatal diagnosis of agenesis of the septum pellucidum

Viñals, Fernando Nuez; Ruiz, P.; Correa, F.; Pereira, Pedro Gonçalves

doi:10.1002/uog.15862

Cited by 15 publications

(33 citation statements)

References 21 publications

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“…We agree with Bault et al 5,6 that measurement of the optic nerves is not feasible because of shadowing from the sphenoid bone. The advantage of our approach, in comparison with that recently described by Vinals et al 7 , is that there is no need for transvaginal examination; a conventional transabdominal approach sufficed. In fact, we attempted to use a transvaginal approach in the preliminary steps of designing the study.…”

Section: Discussionmentioning

confidence: 75%

“…Visualization of the OC in the fetus is needed to suport a diagnosis of septo‐optic dysplasia in fetuses with agenesis of the septum pellucidum. Our series did not include abnormal cases, this study being methodological rather than clinical.…”

Section: Discussionmentioning

confidence: 99%

“…Assessment of the fetal OC is required for the differential diagnosis of absent septum pellucidum, septo‐optic dysplasia being one possible associated lesion with poor prognosis. Since, in septo‐optic dysplasia, there is often optic nerve hypoplasia, some authors have proposed studying the OC in the fetus in order to diagnose this subtle anomaly. It has been shown recently that three‐dimensional (3D) ultrasound (US) and, to a lesser extent, two‐dimensional (2D) US can be used to evaluate the OC.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of fetal optic chiasm: an echoanatomic and reproducibility study

Paladini

Birnbaum

Donarini

et al. 2016

Ultrasound in Obstet & Gyne

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The hyperechoic structure evident on 2D- and 3D-US, just below the circle of Willis, is indeed the OC. 2D-US is apparently as good as 3D-US for visualization of the OC. However, only measurement of the decussation showed low intra- and interoperator variability, whereas measurement of the optic tract is of questionable variability. As gestation advances between 20 and 30 weeks, the OC becomes more oblique in orientation. Copyright © 2016 ISUOG. Published by John Wiley & Sons Ltd.

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Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of fetal optic chiasm: an echoanatomic and reproducibility study

Paladini

Birnbaum

Donarini

et al. 2016

Ultrasound in Obstet & Gyne

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show abstract

“…The OC and optic nerves can be visualized directly using fetal magnetic resonance imaging, including a section at the base of the skull, to determine normality. The OC has also been assessed using transabdominal and transvaginal ultrasound with or without three‐dimensional imaging.…”

mentioning

confidence: 99%

“…also been assessed using transabdominal and transvaginal ultrasound with or without three-dimensional imaging [1][2][3] .…”

mentioning

confidence: 99%

Fetal optic chiasm: three steps for visualization and measurement on routine transabdominal ultrasound

Alonso¹,

Azumendi²,

Romero³

et al. 2019

Ultrasound in Obstet & Gyne

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The optic chiasm (OC) is an X-shaped structure formed by the crossing of the optic nerves in an axial view of the fetal brain. It is located in the chiasmatic cistern and it is surrounded by the Willis circle. The anterior cerebral arteries lay anteriorly, the posterior communicant arteries lay laterally and the posterior cerebral arteries are identified posteriorly. The decussation or centre of the OC corresponds to the origin of the middle cerebral arteries laterally arising from internal carotids. This article is protected by copyright. All rights reserved.

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Fetal Ultrasound and Magnetic Resonance Imaging Findings in Suspected Septo‐Optic Dysplasia

Maduram¹,

Farid²,

Rakow‐Penner³

et al. 2020

J of Ultrasound Medicine

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ObjectivesTo investigate prenatal imaging findings supporting a diagnosis of suspected septo‐optic dysplasia (SOD) by fetal ultrasound (US), magnetic resonance imaging (MRI), or both.MethodsA retrospective review identified 11 patients with SOD: 9 had a clinical diagnosis of SOD postnatally, and 2 were terminated on the basis of suspicious prenatal imaging. Prenatal and neonatal imaging of the cavum septi pellucidi (CSP), frontal horns (FHs), and lateral ventricles was evaluated.ResultsThe appearance of the CSP varied on US and MRI. Complete (“fused”) FHs or partial absence of the CSP was reported in 6 of 11 patients by fetal US and 7 of 8 patients by fetal MRI. The diagnosis of SOD was prospectively suspected prenatally in 6 of 11 and in an additional 5 of 11 cases retrospectively. Fetal MRI incorrectly initially reported normal morphologic abnormalities for 2 cases with partial absence of the CSP, whereas US accurately identified the morphologic abnormalities in 1 of these cases before MRI. Imaging features were first suggested at anatomic US (4 patients) and follow‐up prenatal US (2 patients). Neonatal imaging was concordant in all 9 live births: 5 completely absent CSP, 3 partially absent CSP, and 1 completely present CSP. Clinical manifestations included optic nerve hypoplasia (9 of 9), panhypopituitarism (5 of 9), and neurodevelopmental delays.ConclusionsPrimary imaging features of SOD are “continuous” FHs with complete or partial absence of the CSP. Septo‐optic dysplasia can be suspected in utero and can appear isolated but has substantial associated central nervous system anomalies identified on fetal MRI or after birth. Partial absence of the CSP can be a prenatal sign of suspected SOD, although fetal MRI lacked the spatial resolution to identify it accurately in all cases.

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Two‐dimensional visualization and measurement of the fetal optic chiasm: improving counseling for antenatal diagnosis of agenesis of the septum pellucidum

Cited by 15 publications

References 21 publications

Assessment of fetal optic chiasm: an echoanatomic and reproducibility study

Assessment of fetal optic chiasm: an echoanatomic and reproducibility study

Fetal optic chiasm: three steps for visualization and measurement on routine transabdominal ultrasound

Fetal Ultrasound and Magnetic Resonance Imaging Findings in Suspected Septo‐Optic Dysplasia

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