First Trimester Neurosonography: Imaging Protocols for 2026 Conference

Key Takeaways

• First trimester neurosonography - performed between 11 and 14 weeks of gestation - can identify central nervous system anomalies far earlier than standard second-trimester anatomy scans.
• Imaging protocols remain an active area of evolution, with ISUOG providing current guidance on planes, structures, and transducer approach selection.
• Early detection opens a critical window for family counseling and care planning before the second trimester.
• The Best of the Big Apple OB-GYN Ultrasound 2026 conference will feature dedicated neurosonography sessions on November 14 - read on to see what MFM specialists can expect from the day's agenda.

Early fetal brain imaging is no longer a future-facing ambition. For maternal-fetal medicine specialists, staying current on imaging protocols and diagnostic thresholds is directly tied to patient outcomes - and the 2026 conference season is reflecting that shift.

Early Fetal Brain Scanning Gets a Dedicated Spotlight in 2026

For years, detailed fetal brain evaluation was largely treated as second-trimester work. That assumption is changing. Improved transducer resolution, refined imaging planes, and a stronger evidence base for what is visible at 11-14 weeks have pushed first trimester neurosonography into the mainstream clinical conversation - and onto the CME agenda.

World Class CME's The Best of the Big Apple OB-GYN Ultrasound 2026, running November 13-15 at the New York Marriott Downtown, dedicates a full afternoon block on November 14 specifically to neurosonography. Two back-to-back sessions cover first trimester basics and broader fetal brain evaluation - a pairing that reflects both the clinical urgency and the growing complexity of the topic.

What First Trimester Neurosonography Actually Captures

First trimester neurosonography is a specialized ultrasound examination of the fetal brain performed between 11 and 14 weeks of gestation. At that gestational window, a skilled examiner can visualize key intracranial structures and screen for central nervous system anomalies that would otherwise go undetected until the mid-trimester anatomy scan.

An Evolving Protocol, Not a Settled Standard

The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) provides the most widely referenced guidance for performing first trimester neurosonography, including recommended imaging planes and the structures that should be systematically assessed. The protocol is not static. Advances in ultrasound technology - particularly higher-resolution transducers and 3D/4D imaging capabilities - continue to expand what is diagnostically achievable at this gestational age, and clinical guidance is updated accordingly.

That evolution is part of why continuing education in this area carries real weight. What was considered an adequate first trimester brain survey several years ago may fall short of current expectations.

Structures Evaluated Under Current Guidance

Under established imaging protocols, first trimester neurosonography aims to visualize structures including:

• The falx cerebri - the midline interhemispheric structure
• Choroid plexuses - which should appear echogenic and symmetric at this stage
• The brainstem - assessed via specific midsagittal planes
• Posterior fossa landmarks - including the fourth ventricle and intracranial translucency (IT), a marker increasingly associated with open spina bifida screening

Both transabdominal and transvaginal approaches are used depending on fetal position, maternal body habitus, and image quality requirements.

Why Early Detection Changes Patient Outcomes

The clinical case for first trimester neurosonography centers on what becomes possible - diagnostically and for families - when an anomaly is identified weeks earlier than it would have been otherwise.

Conditions Identifiable Before the Second Trimester

Case-based evidence shows that detailed first trimester scanning can identify several significant conditions earlier in pregnancy, including:

• Anencephaly - absence of the cranial vault and cerebral hemispheres
• Holoprosencephaly - failure of the forebrain to divide into two hemispheres
• Severe ventriculomegaly - abnormal enlargement of the lateral ventricles

Each of these carries meaningful implications for prognosis, delivery planning, and the conversations that need to happen with patients and families as early as possible.

Earlier Counseling, Better-Informed Families

Early identification allows prenatal counseling to begin before the emotional and logistical pressures of a later-trimester diagnosis. Families have more time to consult with specialists, understand their options, and make decisions without the compressed timelines that a 20-week finding often forces. For MFM specialists, this translates into more thorough, less reactive care coordination - and a meaningfully different patient experience.

Choosing the Right Imaging Approach for Early Fetal Brain Scans

There is no single correct approach to first trimester neurosonography. The decision between transabdominal and transvaginal scanning - and how to optimize either - depends on several intersecting factors.

When Transvaginal Offers Greater Clarity

Transvaginal sonography often provides superior resolution for first trimester fetal brain assessment, particularly when the uterus is anteverted, when fetal position limits transabdominal window quality, or when the gestational age is at the earlier end of the 11-14 week range. The closer proximity of the transvaginal transducer to the fetal structures allows for higher-frequency imaging and finer anatomical detail - especially useful for evaluating posterior fossa structures and brainstem landmarks.

Case-Dependent Factors That Guide Approach Selection

In practice, the approach is rarely a rigid protocol decision. Factors that influence which route - or combination of routes - an examiner uses include:

• Fetal lie and position at the time of the scan
• Maternal BMI and abdominal wall thickness
• Gestational age within the first trimester window
• Clinical indication - whether the scan is routine screening or targeted following a prior finding
• Equipment available, including transducer frequency range and 3D capability

Standardizing the approach within a clinical setting - and documenting the rationale for route selection - also supports reproducibility when findings are compared across centers or follow-up scans.

The November 14 Neurosonography Sessions at Big Apple 2026

The Saturday afternoon program at Big Apple 2026 places two neurosonography sessions side by side, creating a focused learning block for attendees who want depth on this topic.

'First Trimester Neurosonography: The Basics' by Dr. Ana Monteagudo

Scheduled for 1:45 PM on November 14, this session is led by Dr. Ana Monteagudo, MD, Professor of Obstetrics, Gynecology and Reproductive Science at the Icahn School of Medicine at Mount Sinai in New York. Dr. Monteagudo is a recognized voice in early obstetric ultrasound and fetal imaging. Her session is positioned as a foundational review - covering core imaging concepts, protocol structure, and what clinicians should be able to reliably identify in a first trimester neurosonography exam.

'How Not to Be Intimidated by the Fetal Brain' by Dr. Timor-Tritsch

Immediately following at 2:20 PM, Dr. Ilan E. Timor-Tritsch, MD - Clinical Professor of OB/GYN at the Icahn School of Medicine, Mount Sinai Hospital System, and one of the conference's program directors - presents a session aimed at the discomfort many clinicians feel when confronted with fetal brain imaging. The title signals the approach: practical, confidence-building, and grounded in real clinical scenarios. Together, the two sessions move from foundational knowledge to applied skill-building within a single afternoon block.

What the Full Big Apple 2026 Conference Delivers for MFM Specialists

Neurosonography is one highlight in a broader three-day program designed for clinicians who use ultrasound across the full spectrum of obstetric and gynecologic care. The 2026 agenda spans November 13-15 and features content across:

• Advanced fetal cardiac imaging - optimizing heart views, outflow tracts, and three-vessel assessment
• Placental and cord pathology, including abnormal myometrial vascularity
• Fetal GI and urinary tract evaluation
• Cesarean scar management across gynecologic and obstetric contexts
• Challenging patient scanning - tips and technique adjustments for patients with higher BMI
• Counseling after prenatal diagnosis - a session directly addressing how to deliver difficult news

The conference draws faculty from Yale School of Medicine, NYU Grossman School of Medicine, Harvard Medical School, and the Icahn School of Medicine at Mount Sinai, among others. Up to 19 AMA PRA Category 1 Credits™ are available, along with 19 ACOG Cognate Credits. Accreditation extends to sonographers, nurse practitioners, physician assistants, and radiologic technologists.

Registration fees for the 2026 conference are $1,595 for physicians and $1,075 for sonographers. Groups of two or more registering together each receive $75 off - contact World Class CME at (980) 819-5095 or office@worldclasscme.com to apply the discount.

Book Early: Hotel Rooms at the New York Marriott Downtown Sell Out Fast

The conference is held at the New York Marriott Downtown in Lower Manhattan - walking distance from the 9/11 Memorial and Museum, the Brooklyn Bridge, Brookfield Place, and the Oculus Center. A block of rooms has been reserved starting at $355 per night (no facility fee), but availability is limited. The reservation deadline is Monday, October 26, 2026. Most years, the hotel block sells out before the deadline. Rooms can be booked directly through the conference hotel link.

For MFM specialists looking to stay current on early fetal brain imaging and build practical confidence with first trimester neurosonography protocols, World Class CME continues to be a trusted resource for evidence-based, expert-led continuing medical education.

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