Fetal Magnetic Resonance Imaging in Ventriculomegaly Assessment

Fetal magnetic resonance imaging (MRI) has emerged as a vital adjunct to obstetric ultrasound in the evaluation of ventriculomegaly, the prenatal enlargement of the lateral cerebral ventricles. By offering superior soft-tissue contrast and multiplanar views without ionising radiation, MRI enhances detection of associated anomalies, refines aetiological classification and informs prognostic counselling. Fast imaging sequences mitigate motion artefact, while high-resolution T2 and T1 protocols delineate ventricular morphology, parenchymal development and haemorrhagic or migrational abnormalities. Quantitative approaches—ranging from two-dimensional measurements to three-dimensional volumetric segmentation—have begun to define normative trajectories and thresholds for intervention. Collectively, these advances support targeted genetic testing, guide perinatal management and facilitate multidisciplinary planning, with the ultimate aim of improving neurodevelopmental outcomes for affected fetuses.

Research from Nature Portfolio

Recent studies have characterised the long-term neurodevelopmental sequelae of isolated fetal ventriculomegaly. One cohort investigation revealed that a significant proportion of children with antenatal isolated enlargement exhibit autism-spectrum traits, sustained attention deficits and executive-function impairments at school age, linking prenatal ventricular size to cortical overgrowth and later behavioural profiles. Another large-scale analysis of chromosomal microarray testing in fetuses with ventriculomegaly demonstrated a higher incidence of pathogenic copy-number variants in bilateral, non-isolated and severe presentations. This work underpins the recommendation of genome-wide array testing as a first-tier prenatal diagnostic tool, highlighting the stratification of risk based on laterality, isolation and severity parameters.

Fetal Magnetic Resonance Imaging in Ventriculomegaly Assessment publication trend

The graph below shows the total number of articles in fetal magnetic resonance imaging in ventriculomegaly assessment across all publications each year (not limited to Nature Index journals).

Technical terms

Ventriculomegaly: Prenatal enlargement of the lateral cerebral ventricles, defined when ventricular atrial width exceeds 10 mm.

Fetal MRI: In utero magnetic resonance imaging technique offering high-contrast, multiplanar views of the developing brain without ionising radiation.

Ultrafast T2 weighted imaging: Rapid acquisition sequence used to minimise motion artefact while delineating cerebrospinal fluid spaces and brain structures.

Volumetric segmentation: Three-dimensional delineation and quantification of brain regions or ventricles using software-based reconstruction.

Endoscopic third ventriculostomy (ETV): Minimally invasive procedure creating an opening in the floor of the third ventricle to divert cerebrospinal fluid and relieve hydrocephalus.

Isolated ventriculomegaly: Ventricular enlargement occurring without additional structural abnormalities detected on imaging.

References

1. Characterisation of ASD traits among a cohort of children with isolated fetal ventriculomegaly. Nature Communications (2023).
2. Fetal MRI of the supratentorial brain abnormalities: what we should know about ventriculomegaly?. Japanese Journal of Radiology (2023).
3. Current Diagnostic, Counseling, and Treatment Options in Non-Severe and Severe Apparently Isolated Fetal Ventriculomegaly. Biomedicines (2024).
4. Concordance between US and MRI Two-Dimensional Measurement and Volumetric Segmentation in Fetal Ventriculomegaly. Diagnostics (2023).
5. Prenatal diagnosis of chromosomal aberrations by chromosomal microarray analysis in foetuses with ventriculomegaly. Scientific Reports (2020).
6. Clinical Applications of Fetal MRI in the Brain. Diagnostics (2022).