Identify subtle brain anomalies
Many conditions – such as partial agenesis of the corpus callosum, mild ventriculomegaly, or migrational disorders – can be missed on a standard anatomy scan. Neurosonography is specifically designed to detect them.
Fetal neurosonography is a specialised ultrasound examination that focuses exclusively on the fetal brain. It uses high‑frequency transducers and advanced imaging techniques to visualise the brain's anatomy in exceptional detail – far beyond what is possible with a standard anatomy scan.
This targeted examination is typically performed between 20 and 26 weeks, when the brain structures are well‑formed but still accessible. It evaluates the ventricular system, the cerebellum, the corpus callosum, the cortical development, and the posterior fossa – looking for subtle anomalies that might be missed on routine scans. It is the gold standard for diagnosing conditions such as ventriculomegaly, agenesis of the corpus callosum, Dandy‑Walker malformation, and cortical migrational disorders.
At Amytri, our fetal neurosonography is performed by a consultant radiologist with advanced training in fetal neurology. Using state‑of‑the‑art ultrasound equipment, we systematically assess every brain structure, often with three‑dimensional (3D) and Doppler capabilities. We provide a detailed report and, if any abnormality is detected, we discuss the implications, offer genetic counseling, and coordinate with paediatric neurology teams – ensuring comprehensive, multidisciplinary care.
The fetal brain is one of the most complex organs. Detailed neurosonography can identify many conditions early, allowing for informed decisions and perinatal planning.
Many conditions – such as partial agenesis of the corpus callosum, mild ventriculomegaly, or migrational disorders – can be missed on a standard anatomy scan. Neurosonography is specifically designed to detect them.
If a brain abnormality is found, we can plan for specialised neonatal and neurological follow‑up, arrange fetal MRI if needed, and coordinate with paediatric neurosurgery teams – ensuring the best possible care from birth.
For most babies, neurosonography confirms a normally developing brain – providing deep reassurance to parents who may have been anxious about a previous finding.
Our fetal neurosonography follows a strict protocol, examining the brain from multiple planes and using specialised windows to capture every detail.
We measure the lateral ventricles, the third ventricle, and the fourth ventricle – detecting ventriculomegaly or hydrocephalus, which can affect brain development.
We evaluate the cerebellar vermis, hemispheres, and the cisterna magna – crucial for diagnosing Dandy‑Walker malformation and other posterior fossa anomalies.
Using the mid‑sagittal plane, we visualise the corpus callosum – the brain's largest commissure. Agenesis or dysgenesis can be identified with high accuracy.
We assess the development of brain folds – lissencephaly, polymicrogyria, and other migrational disorders can be suspected by abnormal gyral patterns.
We examine the choroid plexus for cysts and other abnormalities that may be markers for chromosomal conditions.
Colour and power Doppler are used to assess cerebral blood flow, including the middle cerebral artery, and to detect vascular malformations.
The ideal window is 20–26 weeks – earlier may limit visibility, later may make some planes difficult.
You can eat and drink normally. A full bladder is not usually required, but may be helpful in early cases.
We use high‑frequency probes, transabdominal and sometimes transvaginal, to obtain multiple planes of the fetal brain. The scan takes 30‑45 minutes and is painless.
We review the findings with you, providing a detailed report. If an anomaly is detected, we discuss its implications, recommend further imaging (e.g., fetal MRI) if needed, and coordinate with genetics and paediatric neurology.
This scan is often performed as a follow‑up to a suspected brain anomaly, but may also be offered to women with higher risk factors.
If the 20‑week scan shows an enlarged ventricle, abnormal posterior fossa, or any other brain concern, neurosonography provides the clarity needed.
Certain serum markers (e.g., low AFP) or NIPT results may increase the likelihood of neural tube defects – neurosonography helps assess the brain and spine.
If you have a family history of brain malformations or genetic syndromes affecting the brain, neurosonography can provide early reassurance or detection.
If you've had a previous pregnancy affected by a brain malformation, neurosonography offers a detailed check for the current pregnancy.
Twins or triplets are at higher risk for brain anomalies – careful evaluation of each baby's brain is recommended.
Even without risk factors, some families choose neurosonography for the deepest possible reassurance about their baby's brain development.
Fetal neurosonography is one of the most demanding areas of fetal medicine. Our consultant radiologist has dedicated training and experience in this field, with a deep understanding of normal and abnormal brain development. We use the latest equipment and advanced techniques to provide the most reliable assessment possible – and we communicate our findings with clarity, sensitivity, and a commitment to supporting you through every outcome.
Fetal neurosonography can be a focused and technical examination – having your partner present helps you both absorb the information and share the experience.
We encourage partners to attend. We explain the structures we are examining, show them on the screen, and answer all your questions. If we find anything, we discuss it together, ensuring you both have a clear understanding and a supportive plan.
It is a dedicated, high‑resolution ultrasound of the fetal brain, performed by a specialist to assess brain structures in detail – beyond what is possible with a standard anomaly scan.
The routine scan (Level II) examines the whole fetus, including the brain. Neurosonography focuses exclusively on the brain, using specialised techniques and multiple imaging planes to detect subtle or complex anomalies.
The ideal timing is between 20 and 26 weeks, when the brain structures are well‑developed and still accessible. Earlier scans may be less informative, and later scans may be limited by fetal position.
Yes. It uses standard diagnostic ultrasound, which has been shown to be safe for both mother and baby. There is no radiation involved.
We will discuss the findings with you in detail. Depending on the condition, we may recommend fetal MRI, genetic testing, or a multidisciplinary consultation with paediatric neurology. We will support you through every step.
No, you can book directly. However, if you have been referred by your obstetrician, we will coordinate closely with them.
From your baby's very first heartbeat to your family's lifelong health — we're here with precision, expertise and care. Reserve your appointment in under a minute.