Was Marginal Cord Insertion Missed on Your Ultrasound? What That Can Mean in New York

When parents review prenatal records after a difficult delivery or an unexpected newborn diagnosis, they may find terms they did not fully understand during pregnancy. One of those terms is marginal cord insertion.

Marginal cord insertion describes where the umbilical cord attaches to the placenta. It may be identified on prenatal ultrasound, particularly during the mid-pregnancy anatomy scan.

If your pregnancy or delivery became complicated and you’re wondering whether the care team should have seen or acted on a cord insertion finding, it can be hard to know where to start.

This guide explains what the actual imaging standard requires, why a finding can still be missed even when the standard is followed correctly, and when a missed or delayed finding might support a medical review in New York.

What Marginal Cord Insertion Means

Marginal cord insertion means that the umbilical cord attaches at or close to the edge of the placenta, rather than at a more central location.

It is an anatomic variation that may be associated with a higher risk of certain pregnancy complications in some cases, including concerns about fetal growth. However, many pregnancies involving marginal cord insertion have normal outcomes.

Marginal cord insertion is different from velamentous cord insertion. With marginal insertion, the cord still joins the placenta directly, although close to its edge. With velamentous insertion, the cord inserts into the fetal membranes rather than directly into the placenta.

The fetal blood vessels then travel through the membranes before reaching the placenta, leaving them less protected.

What Ultrasound Guidance Says

The joint AIUM-ACR-ACOG-SMFM-SRU practice parameter for standard diagnostic obstetric ultrasound states that the placental cord insertion site should be documented when technically possible during a standard second- or third-trimester obstetric ultrasound.

That does not mean every report must contain a cord-insertion statement regardless of circumstances. Ultrasound visualization can be limited by fetal position, placental location, gestational age, maternal body habitus, image quality, and other technical factors.

Still, if a patient’s anatomy-scan report does not mention the cord insertion site, it can be reasonable to ask:

• Was the insertion site visualized?

• Was it documented elsewhere, such as on a sonographer worksheet?

• Were the images adequate to assess it?

• Was follow-up imaging considered if the site could not be seen clearly?

• Did later records, placental pathology, or delivery findings identify an abnormal insertion?

A silent report is not proof of an error. The complete record—not the report alone—is needed to understand what occurred.

How Ultrasound Identifies Cord Insertion

During an obstetric ultrasound, the sonographer evaluates the placenta and attempts to identify the point where the umbilical cord enters it.

Standard grayscale imaging may identify the insertion site. Color Doppler may be used when needed to trace blood vessels and distinguish a marginal insertion from a velamentous insertion.

A detailed first-trimester ultrasound may also include evaluation of placental cord insertion, depending on the type of examination performed and whether the insertion can be

Even when a provider attempts this assessment, the insertion site may not be adequately visible on the first scan. In that setting, the medical question is not merely whether the final report includes the phrase “cord insertion.” It is whether the imaging was reasonable under the circumstances and whether any appropriate follow-up was considered.

A 2023 study based on a February–March 2022 survey of Australian sonographers found that 89.6% of respondents reported having a departmental protocol to document placental cord insertion during the second-trimester anatomy scan.

The study also found that placental cord insertion appeared in the final formal report less often than it appeared in departmental protocols or sonographer worksheets. That study is useful context about reporting practices, but it does not establish a New York legal standard or prove what occurred in an individual pregnancy.

Marginal Versus Velamentous Insertion

Marginal and velamentous cord insertion can be related findings, but they are not the same.

Velamentous insertion alone does not automatically require a scheduled cesarean delivery. However, if vasa previa is present or suspected, delivery planning becomes urgent because exposed fetal blood vessels can be at risk during labor or rupture of membranes.

What Follow-Up May Look Like

There is no single follow-up schedule used for every pregnancy involving marginal cord insertion. Management depends on the exact location of the insertion, fetal growth, placental findings, maternal health, and whether other risk factors are present.

Some practices may order one or more follow-up growth ultrasounds. When clinically indicated, additional imaging may assess:

• Estimated fetal growth

• Amniotic-fluid volume

• Placental appearance

• Doppler blood-flow measurements

• Signs that the insertion site or placental function may be contributing to growth concerns

If fetal growth and other findings remain reassuring, a care team may continue ordinary prenatal care or use limited additional monitoring. If there is fetal growth restriction, abnormal Doppler testing, low fluid, or another concern, the care plan may change.

Because cord insertion classification can evolve during pregnancy, later imaging may be useful in selected circumstances.

When a Missed Finding May Warrant Review

A missed or undocumented cord insertion finding does not automatically establish medical malpractice. In New York, a claim generally requires proof that a provider departed from accepted medical practice and that the departure caused a compensable injury.

Questions that may matter in a records review include:

• Was the placental cord insertion reasonably visible on the ultrasound images?

• Did the final report accurately reflect what the images showed?

• If the insertion could not be visualized, was further imaging considered when clinically appropriate?

• If a marginal or velamentous insertion was identified, did the care team make a reasonable follow-up plan?

• Were concerning fetal-growth findings recognized and addressed?

• Did the family receive understandable information about the finding and next steps?

• Did the baby experience complications that a qualified medical expert can connect to the alleged failure?

The answer usually requires review of the original ultrasound images, not just typed reports. Prenatal visit records, fetal-growth studies, labor-and-delivery records, neonatal records, and placental pathology may also be important.

Records to Request

If you are trying to understand whether a cord insertion finding was identified or appropriately followed, request complete copies of:

• Ultrasound images from every prenatal scan

• Final ultrasound reports

• Sonographer worksheets or technical notes, if available

• Prenatal office notes and referral records

• Maternal-fetal-medicine consultation records

• Fetal-growth ultrasound and Doppler reports

• Labor-and-delivery records, including fetal-monitoring strips

• Newborn and NICU records

• Placental pathology reports, if the placenta was examined

• Patient handouts, portal messages, and other communications about results

The images can be especially important. An expert may sometimes assess whether a finding was visible even if the report did not discuss it. Conversely, the images may show that the insertion could not be reliably evaluated at that stage of pregnancy.

New York Filing Deadlines

New York generally requires a medical-malpractice action to be commenced within 2 years and 6 months of the alleged act, omission, failure, or end of continuous treatment for the same condition.

For an injured child, CPLR 208 may extend the time because of infancy. However, medical-malpractice claims are subject to a 10-year outer limit from accrual.

In a claim that negligent prenatal care injured a child, New York’s Court of Appeals has held that the child’s medical-malpractice claim accrues at live birth.

Claims involving public hospitals or other public entities can involve different procedures and shorter notice requirements.

General Municipal Law 50-e establishes a 90-day baseline for a notice of claim in covered public-entity cases. A court may consider infancy when deciding whether to permit late notice, but infancy does not create an automatic extension.nysenate+1

Deadlines depend on the identity of the provider, the type of institution, and the facts of the claim. Anyone considering a potential claim should seek individualized legal advice promptly.

When to Consider a Legal Review

A review may be worthwhile when:

• A baby had fetal-growth restriction, low birth weight, fetal distress, oxygen deprivation, or NICU admission

• The placenta was later found to have marginal or velamentous insertion

• Prenatal ultrasound reports do not address cord insertion

• A concerning scan was not followed by additional imaging

• Fetal-growth concerns were identified but not monitored or managed

• The delivery involved emergent complications potentially related to placental or cord function

• There are questions about whether prenatal findings were communicated to the patient or delivery team

A legal review isn’t the same as filing a lawsuit. It means an attorney and medical experts look at the specific facts to determine whether the care met New York’s standard and whether a departure from that standard caused harm.

Many families find that a review brings clarity, even when they ultimately decide not to move forward with a claim, and it doesn’t need to happen all at once.

Records take time to collect and review properly, so it’s reasonable to take the time you need, while keeping the filing deadline in mind.

Was Your Baby Injured by Medical Negligence? If you believe a delay in diagnosis or a missed warning sign affected your child’s care in New York, our team can review your medical records and explain your options at no cost. Call 833-99-BIRTH or request a free case review.

Frequently Asked Questions

Is cord-insertion documentation required in every ultrasound report?

The current joint obstetric-ultrasound practice parameter says the placental cord insertion site should be documented when technically possible during a standard second- or third-trimester obstetric ultrasound. A report that does not mention the insertion does not automatically prove that it was missed or that care was below standard.acog+1

If my ultrasound report does not mention cord insertion, was it missed?

Not necessarily. The site may have been assessed but omitted from the final report, or it may not have been adequately visible. Request the ultrasound images, report, and any available sonographer worksheet before drawing conclusions.

Does a missed cord insertion finding prove malpractice?

No. A claim requires proof that the provider’s care departed from accepted practice and that the departure caused injury. Whether a finding was reasonably identifiable, whether follow-up would have been appropriate, and whether different care would likely have changed the outcome are expert questions.

Does marginal cord insertion always cause pregnancy complications?

No. Although marginal insertion can be associated with certain complications in some pregnancies, many pregnancies have normal growth and normal outcomes.

Does velamentous insertion always require a C-section?

No. Velamentous insertion does not by itself always require cesarean delivery. The key concern is whether exposed fetal vessels are near the cervix, which can indicate vasa previa and may require specialized delivery planning.pubmed.ncbi.nlm.nih

How long do I have to file a claim in New York?

The ordinary deadline for medical malpractice is generally 2 years and 6 months. An infant’s claim may receive an infancy extension, but medical-malpractice claims have a 10-year outer limit, and claims against public hospitals may involve a separate notice-of-claim deadline.