Medical Disclaimer This article is for educational purposes only and does not replace medical advice, diagnosis, or treatment. Coronal craniosynostosis evaluation and treatment depend on your child’s age, head shape, eye and facial findings, growth pattern, imaging, symptoms, and specialist assessment. Always talk with your child’s pediatrician, craniofacial team, pediatric neurosurgeon, craniofacial plastic surgeon, ophthalmologist, or healthcare professional about your child’s individual situation.
One of the most concerning things parents may notice is that one side of their baby’s forehead, eye, brow, or face looks different.
Parents may say:
- “My baby’s forehead is flat on one side.”
- “One eye looks bigger or higher.”
- “One eyebrow looks lifted.”
- “The nose looks pulled to one side.”
- “My baby’s face looks a little twisted.”
- “The forehead is flat on one side and fuller on the other.”
- “The pediatrician mentioned coronal craniosynostosis.”
These can be signs of coronal craniosynostosis, especially when one coronal suture closes too early. Coronal craniosynostosis can affect the forehead, brow, upper eye socket, nose, and facial symmetry because the coronal sutures are located near the front and sides of the skull.
The short answer is:
Coronal craniosynostosis happens when one or both coronal sutures close too early. If one coronal suture closes early, it is called unicoronal or unilateral coronal craniosynostosis. It can cause flattening of the forehead and brow on one side, a raised or differently shaped eye socket, nose deviation, and facial asymmetry. If both coronal sutures close early, it is called bicoronal craniosynostosis and can cause a short, wide head shape.
The CDC explains that the right and left coronal sutures run from each ear to the sagittal suture at the top of the head. Early closure of one coronal suture may cause a flattened forehead on that side, a raised eye socket, and the nose pulling toward that side. The CDC also notes that coronal synostosis is the second most common type of craniosynostosis. (CDC)
This guide explains coronal craniosynostosis in parent-friendly language: what it looks like, why the eyes and face can look asymmetric, how doctors diagnose it, and what treatment options families may discuss.
Quick Answer: What Is Coronal Craniosynostosis?
Coronal craniosynostosis is early fusion of one or both coronal sutures.
The coronal sutures run from each ear area toward the top/front of the skull, meeting near the soft spot. When one coronal suture closes too early, the skull cannot grow normally in that front-side area. This can change the shape of the forehead, brow, upper eye socket, nose, and face.
When one coronal suture closes early, it may be called:
Unicoronal craniosynostosisUnilateral coronal synostosisOne-sided coronal synostosisAnterior plagiocephaly
When both coronal sutures close early, it may be called:
Bicoronal craniosynostosisBilateral coronal synostosisBrachycephaly, when the head is short and broad
Mayo Clinic explains that when one coronal suture closes early, the forehead may flatten on that side and bulge on the other side; the nose may turn, and the eye socket may rise on the affected side. When both coronal sutures close early, the head may look short and wide, often with the forehead tilted forward. (Mayo Clinic)
The parent-friendly takeaway:
Coronal craniosynostosis is the craniosynostosis type most associated with forehead, brow, eye-socket, and facial asymmetry.
What Are the Coronal Sutures?
A baby’s skull is made of several bones connected by flexible seams called sutures. These sutures allow the skull to expand as the brain grows.
The coronal sutures are the two seams near the front-sides of the skull. There is one on the right and one on the left. They run roughly from the ear area toward the top/front of the head.
Because the coronal sutures are near the forehead and eye sockets, early fusion can affect the front of the skull and the upper face.
The CHOP craniosynostosis caregiver handbook describes the coronal sutures as the two seams that run from the soft spot, or anterior fontanelle, to the ear.
The practical message:
The coronal sutures sit close to the forehead, brow, and eye sockets. That is why coronal craniosynostosis can change more than the top of the head.
Unicoronal vs Bicoronal Craniosynostosis
- Coronal craniosynostosis can affect one side or both sides.
- Type
- What closes early
- Common pattern
- Unicoronal craniosynostosis
- One coronal suture
One-sided forehead flattening, brow flattening, raised or differently shaped eye socket, nose/facial asymmetry
- Bicoronal craniosynostosis
- Both coronal sutures
- Short, wide head shape, often with a tall or prominent forehead
- Syndromic coronal craniosynostosis
- Often coronal sutures, sometimes multiple sutures
- May involve skull, face, airway, eyes, hearing, hands, feet, genetics, or other systems
The CDC describes one-sided coronal synostosis as causing anterior plagiocephaly and bicoronal synostosis as causing a broad, short head shape called brachycephaly. (CDC)
The parent-friendly takeaway:
One coronal suture usually creates asymmetry. Both coronal sutures usually create a shorter, wider head shape.
What Does “Unicoronal” Mean?
Unicoronal means one coronal suture is involved.
In unicoronal craniosynostosis, one front-side growth seam closes too early. The forehead and brow on that side cannot grow forward normally. The other side may grow more, making the difference between the two sides more noticeable.
Parents may notice:
- One side of the forehead looks flat
- One eyebrow or brow area looks flatter or pulled back
- The opposite forehead looks more prominent
- One eye appears taller, wider, higher, or more open
- The nose appears pulled or turned
- The face looks slightly rotated or asymmetric
The CHOP caregiver handbook describes unicoronal synostosis as involving one coronal suture, with one side of the forehead and brow flatter and pulled backward compared with the other side; it also notes that the eye on the flat side may appear taller and larger and that the bridge of the nose may bend toward the flat side.
The parent-friendly clue:
Unicoronal craniosynostosis is often the “one-sided forehead, brow, eye, and face asymmetry” type.
What Does “Anterior Plagiocephaly” Mean?
Parents may hear the term anterior plagiocephaly.
“Anterior” means front.“Plagiocephaly” means an asymmetric head shape.
So anterior plagiocephaly means an asymmetric head shape involving the front of the skull.
This is different from the more common positional plagiocephaly that usually affects the back of the head.
The CDC uses the term anterior plagiocephaly for the flattened forehead pattern that can happen when one coronal suture closes early. (CDC)
The practical message:
Anterior plagiocephaly usually points doctors toward the front of the skull and the coronal suture, not just a positional flat spot on the back of the head.
Why Does One Side of the Forehead Look Flat?
The forehead looks flat because the fused coronal suture restricts growth on that side.
The brain still grows. The skull still needs to expand. But because one coronal suture is fused, growth is redirected to other open sutures and other parts of the skull.
This can create a pattern where:
- The affected forehead is flat or pulled back
- The opposite forehead appears fuller or more prominent
- The brow on the affected side looks flatter or higher
- The upper eye socket changes shape
- The nose and face may appear shifted
Mayo Clinic explains that one-sided coronal suture closure can flatten the forehead on that side and cause bulging on the other side, along with nose turning and eye-socket elevation on the affected side. (Mayo Clinic)
The simple explanation:
The flat side is usually the side where the coronal suture closed early. The fuller side often reflects compensatory growth.
Why Does One Eye Look Higher, Larger, or Different?
Coronal craniosynostosis can change the shape of the bones around the upper eye socket.
Parents may describe:
- One eye looks higher
- One eye looks bigger
- One eyelid opening looks wider
- One eyebrow looks raised
- One eye socket looks more shallow
- One eye appears more prominent
This happens because the coronal suture sits near the forehead and upper orbit, meaning the bony area around the eye. If growth is restricted there, the orbital rim and brow can shift.
The CDC states that the baby’s eye socket on the affected side may be raised when a coronal suture closes early. (CDC) Mayo Clinic similarly states that one-sided coronal closure can cause the eye socket to rise on the affected side. (Mayo Clinic)
Some clinicians may use the phrase harlequin eye or harlequin orbit to describe the raised, differently shaped eye socket seen on imaging or exam. Parent-facing articles do not always use this term, but families may see it in a report.
The parent-friendly takeaway:
The eye itself may be healthy, but the bones around the eye can make one eye look higher, larger, or shaped differently. An eye exam may still be important.
Why Can the Nose or Face Look Shifted?
Because the skull and face grow together, one-sided coronal craniosynostosis can make the face look slightly rotated or twisted.
Parents may notice:
- The bridge of the nose bends toward the flat side
- The nose tip seems angled
- One cheek or eye area looks different
- The face seems rotated in photos
- One ear or eyebrow seems out of line with the other
The CDC notes that in coronal synostosis, the nose can be pulled toward the side where the suture closed early. (CDC) The CHOP caregiver handbook similarly describes the bridge of the nose as bending toward the flat side in unicoronal synostosis.
The practical message:
Coronal craniosynostosis can look like a facial difference, not just a skull difference. That does not mean anything is “wrong” with your baby’s face; it means skull growth is affecting facial symmetry.
What Does Bicoronal Craniosynostosis Look Like?
Bicoronal craniosynostosis means both coronal sutures close too early.
Because both front-side sutures are involved, the pattern is usually more symmetric than unicoronal craniosynostosis.
Parents may notice:
- A short head from front to back
- A wide head from side to side
- A tall or prominent forehead
- A flatter forehead
- A flatter back of the head
- A head shape that looks broad and short
The CDC explains that when the coronal sutures on both sides close too early, the baby’s head grows broad and short, a shape called brachycephaly. (CDC) The CHOP caregiver handbook describes bicoronal synostosis as involving both coronal sutures and causing the head to grow side to side rather than front to back, creating a wide, flat head with a tall forehead.
The parent-friendly clue:
Unicoronal craniosynostosis tends to be asymmetric. Bicoronal craniosynostosis tends to make the head short and wide.
Is Coronal Craniosynostosis the Same as Flat Head Syndrome?
No.
Flat head syndrome, often called positional plagiocephaly, is usually caused by external pressure on a baby’s skull while the sutures remain open. Coronal craniosynostosis is caused by early fusion of a skull suture.
This distinction matters because positional flattening often improves with repositioning, tummy time, physical therapy for torticollis, or helmet therapy in selected cases. Coronal craniosynostosis does not improve simply by repositioning because the growth seam is fused.
HealthyChildren.org explains that positional skull deformities often happen when a baby spends a lot of time in one position, commonly during the first 4 to 12 weeks of life, and that common positional skull deformities do not require surgery. It also notes that deformational plagiocephaly usually causes flattening at the back of the head, with the ear shifted forward on the flat side and the forehead more prominent, creating a parallelogram-like shape. (HealthyChildren.org)
The practical distinction:
Feature
More typical of positional flat head
More concerning for coronal craniosynostosis
Main flat area
Back or side-back of head
One side of forehead/brow
Cause
Pressure or preferred head position
One coronal suture fused early
Ear shift
Often forward on flat side
May be associated with facial/orbital asymmetry
Forehead
May be prominent on same side as back flattening
Flat or pulled back on affected side
Eye/brow
Usually not a raised orbit pattern
One eye/brow may look higher, taller, or different
Nose
Usually not twisted from suture fusion
Nose may be pulled or turned
Treatment
Repositioning, tummy time, PT, helmet in selected cases
Craniofacial evaluation; surgery often discussed
The patient-friendly takeaway:
Back-of-head flatness is often positional. One-sided forehead, brow, eye, and nose changes should raise the question of coronal craniosynostosis.
Can Coronal Craniosynostosis Affect Vision?
It can affect the eye area and may be associated with eye conditions that need follow-up.
Coronal craniosynostosis changes the bones around the orbit. In some children, this can be associated with:
- Strabismus, or eye misalignment
- Astigmatism or unequal focusing between eyes
- Amblyopia, sometimes called “lazy eye”
- Orbital asymmetry
- Eye movement differences
A review summarized in Europe PMC reports that ophthalmic manifestations of unilateral coronal synostosis include harlequin deformity, anisometropic astigmatism, strabismus, amblyopia, and significant orbital asymmetry. (Europe PMC) Another pediatric ophthalmology study notes that unilateral coronal synostosis alters orbital development and can be associated with strabismus, astigmatism, and amblyopia. (Europe PMC)
This does not mean every child with coronal craniosynostosis will have vision loss. It means eye monitoring is important.
The practical message:
Ask whether your child should see a pediatric ophthalmologist, especially if one eye looks different, the eye alignment seems off, or the craniofacial team recommends baseline vision monitoring.
Is Coronal Craniosynostosis Usually Isolated or Syndromic?
It can be either.
Many babies with one fused coronal suture have isolated, nonsyndromic craniosynostosis. But coronal craniosynostosis, especially bicoronal craniosynostosis or craniosynostosis with other findings, can raise more questions about genetics.
Mayo Clinic explains that nonsyndromic craniosynostosis is the most common type and is thought to involve a mix of genetic and environmental factors, while syndromic craniosynostosis is caused by gene changes associated with syndromes such as Apert, Pfeiffer, and Crouzon. (Mayo Clinic) Seattle Children’s notes that most children with craniosynostosis have only one fused suture and are otherwise healthy, but more than one fused suture may be part of a genetic condition such as Crouzon, Apert, Saethre-Chotzen, Muenke, or Pfeiffer syndrome. (Seattle Children's)
The CHOP caregiver handbook states that bicoronal synostosis may exist in isolation, but it is the craniosynostosis type most frequently associated with a syndrome when other anomalies are present.
The parent-friendly takeaway:
One-sided coronal synostosis may be isolated. Bicoronal synostosis or coronal synostosis with other findings often leads doctors to discuss genetic testing and broader specialty evaluation.
Did I Cause My Baby’s Coronal Craniosynostosis?
Usually, no.
Parents often worry that sleep position, car seats, baby carriers, tummy time, birth position, or something they did during pregnancy caused the head shape. Coronal craniosynostosis is not caused by how parents hold a baby or by safe back sleeping.
The CDC states that the causes of craniosynostosis are unknown in most infants. Some cases are related to a single-gene abnormality, while most are thought to involve a combination of genes and other factors. (CDC)
The patient-friendly takeaway:
Coronal craniosynostosis is not caused by ordinary parenting choices. It is a skull-growth condition that deserves evaluation, not blame.
How Is Coronal Craniosynostosis Diagnosed?
Diagnosis usually starts with a careful exam by a pediatrician, craniofacial surgeon, pediatric neurosurgeon, or craniofacial team.
The clinician may:
- Look at the forehead from the front and side
- Look at the head from above
- Feel for a ridge along the coronal suture
- Compare both sides of the forehead
- Look at brow height and shape
- Look at eye shape, eye position, and eye symmetry
- Look at nose position and facial rotation
- Measure head circumference
- Review head growth over time
- Check the soft spot
- Ask when the head or face shape was first noticed
- Ask about feeding, sleep, development, vision, hearing, and breathing
- Look for signs that more than one suture may be involved
Mayo Clinic states that craniosynostosis diagnosis may include physical exam, imaging such as CT, MRI, or cranial ultrasound, and genetic testing if a genetic syndrome is suspected. (Mayo Clinic) Seattle Children’s explains that doctors often diagnose craniosynostosis in the first weeks of life by examining and measuring the child’s head; head shape helps identify which sutures are fused, and CT can confirm diagnosis and help plan treatment. (Seattle Children's)
The practical message:
Coronal craniosynostosis is diagnosed by the pattern of forehead, brow, eye, nose, face, head growth, and sometimes imaging — not by one photo alone.
Does My Baby Need Imaging?
Maybe.
Imaging can help confirm which suture is fused and help the surgical team plan treatment. Depending on the situation and center, imaging may include CT, 3D CT, cranial ultrasound, MRI, or surface imaging.
Mayo Clinic explains that CT, MRI, or cranial ultrasound can show whether sutures have fused, and that imaging, laser scans, and photographs may be used to make precise skull measurements and plan surgery. (Mayo Clinic) Seattle Children’s states that CT can confirm the diagnosis and help plan treatment. (Seattle Children's)
The parent-friendly takeaway:
Ask whether imaging is needed now, what type is recommended, and whether the craniofacial team should evaluate your baby before imaging is ordered.
Why Early Referral Matters
Early referral matters because coronal craniosynostosis can affect the forehead, eye socket, face, and surgical timing.
A craniofacial team can:
- Confirm whether the coronal suture is fused
- Distinguish coronal craniosynostosis from positional head-shape changes
- Assess the eyes and face
- Recommend imaging if needed
- Discuss genetics if appropriate
- Explain whether surgery is recommended
- Explain the timing of surgery
- Discuss whether ophthalmology or other specialists should be involved
HealthyChildren.org, summarizing AAP guidance, states that craniosynostosis leads to head-shape changes usually distinguishable from positional deformity and recommends early referral to surgical specialists for craniosynostosis repair. (HealthyChildren.org) Seattle Children’s notes that surgery recommendations depend on which suture is affected and the baby’s age. (Seattle Children's)
The practical message:
A referral does not mean surgery is already decided. It means the right team can confirm the diagnosis while timing-sensitive options are still available.
Does Every Baby With Coronal Craniosynostosis Need Surgery?
Not every case is identical, but many babies with craniosynostosis are treated surgically.
Mayo Clinic states that mild craniosynostosis may not need surgery, but for most babies surgery is the main treatment. The purpose of treatment is to reshape the head, lessen or prevent pressure on the brain, and create room for proper brain growth. (Mayo Clinic)
For coronal craniosynostosis, surgery decisions depend on:
- Whether one or both coronal sutures are fused
- How severe the forehead and eye-socket asymmetry is
- Whether the head shape is worsening
- The baby’s age
- Whether the condition is isolated or syndromic
- Whether there are eye or vision concerns
- Whether there are signs of increased pressure
- Whether other sutures are involved
- The craniofacial team’s recommendation
The patient-friendly takeaway:
The diagnosis matters, but the treatment plan depends on the whole child — age, anatomy, head growth, eyes, symptoms, and whether one or both coronal sutures are involved.
What Is Surgery Trying to Correct?
Coronal craniosynostosis surgery may aim to:
- Release the restriction caused by the fused coronal suture
- Improve forehead shape
- Improve brow symmetry
- Improve upper eye socket shape
- Create more room for brain growth
- Reduce or prevent pressure concerns
- Improve facial balance and symmetry
- Protect the eyes in selected cases
Seattle Children’s explains that craniosynostosis surgery expands and reforms the cranial bones, helps the skull grow into a more typical shape, and helps prevent pressure buildup on the brain. (Seattle Children's) For fronto-orbital advancement, Seattle Children’s states that the plastic surgeon and neurosurgeon move and reshape the forehead and upper eye sockets, creating more space for the brain and more protection for the eyes. (Seattle Children's)
The simple explanation:
Coronal craniosynostosis surgery is usually skull and forehead/eye-socket surgery, not surgery on the brain tissue itself.
What Is Fronto-Orbital Advancement?
Fronto-orbital advancement , often shortened to FOA, is a common open surgery for metopic and coronal craniosynostosis.
“Fronto” refers to the forehead.“Orbital” refers to the eye sockets.“Advancement” means moving the bones forward or into a better position.
In FOA, surgeons reshape the forehead and upper eye socket region. This can improve forehead contour, brow position, orbital shape, and space for the growing brain.
Seattle Children’s states that it often recommends open fronto-orbital advancement for babies with fused metopic or coronal sutures, often around 9 to 12 months depending on the suture involved; the procedure reshapes the forehead and upper eye sockets and usually takes 4 to 5 hours, with most babies staying in the hospital 3 to 4 days including 1 day in the ICU. (Seattle Children's)
The parent-friendly takeaway:
FOA is the classic open surgery that addresses the forehead and upper eye socket changes seen in coronal craniosynostosis.
Can Endoscopic Surgery Be Used for Coronal Craniosynostosis?
Sometimes, in selected young babies and at centers that offer it.
Endoscopic surgery is a minimally invasive approach in which surgeons remove the fused suture through smaller incisions. Helmet therapy is usually required afterward to guide skull growth.
Mayo Clinic states that endoscopic surgery may be considered for babies up to age 6 months and is better done as soon as possible; after minimally invasive surgery, helmet therapy is used to help shape the skull. (Mayo Clinic) Seattle Children’s notes that for babies 4 months or younger with a single fused metopic or coronal suture, endoscopic strip craniectomy may be an option, but there is a greater chance of needing open surgery later. (Seattle Children's)
The St. Louis Children’s Hospital parent booklet describes open repair and endoscopic repair as options for unicoronal craniosynostosis; it notes that endoscopic repair uses small incisions and helmeting afterward, while open repair reconstructs skull bones into a more typical shape and usually does not require a helmet.
Important parent points:
- Endoscopic surgery is age-sensitive.
- Helmet therapy is usually required afterward.
- Not every coronal case is a good candidate.
- Some centers prefer FOA for coronal craniosynostosis.
- Families should ask about the chance of later open surgery.
The practical message:
Endoscopic surgery may be an option for selected young babies, but many coronal cases are treated with open fronto-orbital advancement.
Will My Baby Need a Helmet?
It depends on the surgical plan.
After endoscopic surgery, helmet therapy is commonly used to guide skull growth. After open fronto-orbital advancement or open cranial vault remodeling, helmet therapy is usually not needed because the bones are reshaped directly during surgery.
Mayo Clinic states that after minimally invasive surgery, babies usually wear a helmet 23 hours a day for about a year, while open surgery usually does not require a helmet afterward. (Mayo Clinic) The St. Louis Children’s booklet similarly describes helmet use after endoscopic repair and no helmet after open repair.
The patient-friendly takeaway:
A helmet does not fix a fused coronal suture by itself. It may be used after certain minimally invasive surgeries to guide growth.
What About Distraction Osteogenesis?
Some centers may discuss distraction osteogenesis for selected coronal cases. This is a technique where bone is gradually moved or expanded over time.
Children’s Hospital Colorado describes distraction osteogenesis as an emerging technique for unicoronal craniosynostosis in which bone is slowly stretched so new bone can form between the separated pieces; it notes that traditional treatment often involves fronto-orbital advancement, while endoscopic strip craniectomy may be used in younger children but requires helmeting and can have less predictable results. (Children's Hospital Colorado)
This is not offered everywhere and may not be appropriate for every child.
The practical message:
If a center mentions distraction, ask how often they use it, why they recommend it for your child, how many procedures are needed, and how outcomes compare with FOA or endoscopic surgery.
What If Coronal Craniosynostosis Is Diagnosed Late?
Late diagnosis does not mean nothing can be done.
It may change which options are available. Minimally invasive surgery is generally most useful earlier in infancy because it relies on rapid skull growth and helmet molding afterward. Older babies and children are more often evaluated for open cranial vault remodeling, fronto-orbital advancement, or other individualized approaches.
Mayo Clinic states that open surgery is generally done for babies older than 6 months, while endoscopic surgery is considered earlier in infancy. (Mayo Clinic)
The parent-friendly message:
If your baby or child is older, still ask for a craniofacial evaluation. The timing may change the options, but specialists can still assess head shape, eye concerns, pressure risk, and treatment choices.
What Parents Should Do After Hearing “Possible Coronal Craniosynostosis”
A calm next-step plan can help.
1. Ask what the doctor sees
Ask:
- “Is one coronal suture suspected?”
- “Is this unicoronal or bicoronal?”
- “Is the forehead flat on one side?”
- “Is the eye socket raised?”
- “Is the nose pulled or rotated?”
- “Does this look positional or synostotic?”
2. Ask for craniofacial referral
Coronal craniosynostosis is specialized. A craniofacial team can help confirm the diagnosis, explain timing, and decide whether imaging or eye evaluation is needed.
3. Take photos from consistent angles
Helpful photos include:
- Front view of face
- Top view of head
- Both side profiles
- Three-quarter views
- Back view
- Photos after bath time can help because wet hair makes skull shape easier to see.
4. Track head circumference
Ask whether head growth is following the expected curve.
5. Ask whether ophthalmology is needed
Because coronal craniosynostosis can affect the orbit and be associated with strabismus, astigmatism, or amblyopia, ask whether a pediatric eye exam is recommended.
6. Write down questions
Craniofacial appointments are information-heavy. Bring a written list.
You can ask:
- Does this look like coronal craniosynostosis?
- Is the concern one-sided or both sides?
- Is the forehead flat on one side?
- Does one eye socket look raised?
- Does one eye look larger, higher, or differently shaped?
- Does the nose look pulled toward one side?
- Could this be positional plagiocephaly instead?
- Is my baby’s head circumference growing normally?
- Do you feel a ridge along a coronal suture?
- Should we see a craniofacial team?
- Should imaging wait until after specialist evaluation?
- Should we see pediatric ophthalmology?
- Are there any symptoms that should make us call urgently?
At the specialist visit, ask:
- Is this coronal craniosynostosis?
- Is it unicoronal or bicoronal?
- Which side is affected?
- Are any other sutures involved?
- How severe is the forehead asymmetry?
- How severe is the brow or eye-socket asymmetry?
- Is the nose or face rotated because of the skull shape?
- Does this look isolated or syndromic?
- Do we need genetic testing?
- Do we need an ophthalmology exam?
- Do we need imaging?
- If imaging is needed, what kind and why?
- Is surgery recommended?
- What are the goals of surgery?
- Would fronto-orbital advancement be recommended?
- Is endoscopic surgery an option?
- Would helmet therapy be needed?
- How does my baby’s age affect the choices?
- What are the risks of surgery?
- What are the risks of waiting?
- How long is the hospital stay?
- Will blood transfusion be likely?
- Could another surgery be needed later?
- Will surgery correct the eye appearance?
- Could my child still need glasses, patching, or eye-muscle treatment later?
- How often will follow-up happen?
- What should we watch for at home?
Red Flags: When to Call a Doctor Promptly
Many babies with coronal craniosynostosis act like typical babies. Head and facial shape may be the main sign.
Still, call your child’s healthcare professional promptly if your baby has:
Rapidly worsening head or facial asymmetry
A hard ridge with forehead or eye asymmetry
Head circumference that is not growing as expected
A persistently bulging soft spot
Repeated or projectile vomiting
Poor feeding
Unusual sleepiness or decreased alertness
Extreme irritability
High-pitched cry
Very noticeable scalp veins
Developmental delay or loss of skills
New eye movement concerns
Seizure-like activity
Breathing problems
Johns Hopkins lists possible signs of elevated intracranial pressure in craniosynostosis, including a full or bulging fontanelle, sleepiness, noticeable scalp veins, irritability, high-pitched cry, poor feeding, projectile vomiting, increasing head circumference, and developmental delays. (Johns Hopkins Medicine)
Seek urgent medical care if your baby is difficult to wake, has trouble breathing, has repeated vomiting, has seizure-like activity, or seems seriously ill.
Common Parent Fears
“Did I cause this?”
Usually, no. Craniosynostosis is not caused by ordinary parenting choices, safe back sleeping, holding position, car seats, or missed tummy time. The CDC states that causes are unknown in most infants, although genetics and other factors may contribute. (CDC)
“Is my baby’s eye okay?”
The eye may be healthy, but the bones around it can make it look different. Coronal craniosynostosis can also be associated with eye issues such as strabismus, astigmatism, and amblyopia, so ophthalmology follow-up may be recommended. (Europe PMC)
“Will surgery fix the face?”
Surgery often improves forehead, brow, and orbital shape, but the degree of improvement varies. Some children may still need eye follow-up, glasses, patching, strabismus care, or later craniofacial monitoring.
“Is this just cosmetic?”
Appearance matters, but coronal craniosynostosis is not only a cosmetic issue. Treatment goals may include creating room for brain growth, reducing or preventing pressure concerns, improving skull shape, and improving protection and shape around the eyes. Mayo Clinic describes craniosynostosis treatment goals as reshaping the head, lessening or preventing pressure on the brain, and creating room for brain growth. (Mayo Clinic)
“Does this mean my child has a syndrome?”
Not necessarily. Many babies with one fused suture are otherwise healthy. But bicoronal craniosynostosis, multisuture involvement, or other physical findings may lead doctors to discuss genetic testing and broader evaluation. Seattle Children’s notes that most children with one fused suture are otherwise healthy, while children with more than one fused suture may have a genetic condition. (Seattle Children's)
How to Explain Coronal Craniosynostosis to Family
Here is a simple explanation:
“Coronal craniosynostosis means one or both of the skull growth seams near the front side of the head closed too early. If one side is affected, the forehead and brow on that side may look flatter, and the eye socket and nose can look different. If both sides are affected, the head may look short and wide. The craniofacial team will check which suture is fused, whether the eyes are affected, whether imaging or genetic testing is needed, and whether surgery is recommended.”
This helps family members understand why the concern is not just a “flat forehead” or a “different-looking eye.”
- Coronal craniosynostosis happens when one or both coronal sutures close too early.
- The coronal sutures run from each ear area toward the top/front of the skull.
- Unicoronal craniosynostosis means one coronal suture is fused.
- Bicoronal craniosynostosis means both coronal sutures are fused.
Unicoronal craniosynostosis can cause forehead flattening on one side, brow asymmetry, a raised or differently shaped eye socket, nose deviation, and facial asymmetry.
Bicoronal craniosynostosis can cause a short, wide head shape called brachycephaly.
Coronal craniosynostosis is different from positional flat head syndrome.
A one-sided forehead, brow, eye, or nose difference should prompt evaluation for coronal craniosynostosis.
Coronal craniosynostosis can be associated with vision-related issues, so pediatric ophthalmology may be part of care.
One-sided coronal synostosis can be isolated, but bicoronal or multisuture cases may raise more concern for a genetic syndrome.
Diagnosis usually involves exam, head measurements, facial and eye assessment, and sometimes imaging.
Treatment often involves surgery, commonly fronto-orbital advancement for coronal cases.
Endoscopic surgery may be an option for selected very young babies at some centers, but helmet therapy is usually required afterward.
Early referral matters because age can affect surgical options.
The simplest parent-friendly summary is:
Coronal craniosynostosis is the type that can make one side of the forehead, brow, eye socket, nose, or face look different. It should be evaluated by a craniofacial team because the diagnosis, eye follow-up, genetic questions, and surgery timing are all individualized.
Frequently Asked Questions About Coronal Craniosynostosis
What is coronal craniosynostosis?
Coronal craniosynostosis is early fusion of one or both coronal sutures. The coronal sutures run from each ear toward the top/front of the skull. Early closure can affect forehead, brow, eye socket, nose, and facial shape. (CDC)
What is unicoronal craniosynostosis?
Unicoronal craniosynostosis means one coronal suture closes too early. It can cause one side of the forehead and brow to look flatter or pulled back, with eye and facial asymmetry. The CHOP caregiver handbook describes unicoronal synostosis as causing flattening and backward pulling of one forehead/brow side, with the eye on the flat side appearing taller and larger.
What is bicoronal craniosynostosis?
Bicoronal craniosynostosis means both coronal sutures close too early. It can cause the head to grow broad and short, a shape called brachycephaly. (CDC)
Why does one side of the forehead look flat?
The forehead can look flat because the fused coronal suture restricts growth on that side. Mayo Clinic explains that when one coronal suture closes too early, the forehead may flatten on that side and bulge on the other side. (Mayo Clinic)
Why does one eye look higher or bigger?
The eye may look higher, larger, or differently shaped because coronal craniosynostosis can change the bones around the upper eye socket. The CDC notes that the eye socket on the affected side may be raised when one coronal suture closes early. (CDC)
Can coronal craniosynostosis make the nose look crooked?
Yes. The nose or bridge of the nose may appear pulled or turned because the skull and facial bones grow together. The CDC states that the nose may be pulled toward the side of the early coronal suture closure. (CDC)
Is coronal craniosynostosis the same as positional plagiocephaly?
No. Positional plagiocephaly is usually caused by external pressure and often affects the back or side-back of the head. Coronal craniosynostosis is caused by a fused front-side skull suture and often affects the forehead, brow, eye socket, and nose. HealthyChildren.org explains that positional plagiocephaly often causes back-of-head flattening with forward ear shift and does not require surgery. (HealthyChildren.org)
Does coronal craniosynostosis affect vision?
It can be associated with vision-related issues such as strabismus, astigmatism, amblyopia, and orbital asymmetry. A literature summary reports these ophthalmic manifestations in unilateral coronal synostosis. (Europe PMC)
Should my child see an eye doctor?
Ask your craniofacial team. Because coronal craniosynostosis can affect the orbit and be associated with strabismus, astigmatism, and amblyopia, pediatric ophthalmology may be recommended.
Is coronal craniosynostosis genetic?
Sometimes. Many one-suture cases are isolated, but bicoronal craniosynostosis or craniosynostosis with other findings may raise concern for a genetic syndrome. Mayo Clinic lists Apert, Pfeiffer, and Crouzon syndromes as examples of syndromic craniosynostosis. (Mayo Clinic)
Does bicoronal craniosynostosis mean my baby has a syndrome?
Not always, but it increases the reason to ask about genetics. Seattle Children’s notes that children with more than one fused suture may have craniosynostosis as part of a genetic condition, while most children with only one fused suture are otherwise healthy. (Seattle Children's)
Did I cause my baby’s coronal craniosynostosis?
Usually, no. The CDC states that the causes of craniosynostosis are unknown in most infants, though some cases involve genetic factors and many likely involve a combination of genes and other factors. (CDC)
How is coronal craniosynostosis diagnosed?
Diagnosis usually involves physical exam, head measurements, assessment of forehead, brow, eye, nose, and facial symmetry, and sometimes imaging such as CT, MRI, or cranial ultrasound. Mayo Clinic states that diagnosis may include physical exam, imaging studies, and genetic testing if a syndrome is suspected. (Mayo Clinic)
Does my baby need a CT scan?
Maybe. CT can confirm which suture is fused and help with surgical planning, but imaging decisions vary by center and child. Seattle Children’s states that CT confirms diagnosis and helps plan treatment. (Seattle Children's)
Does every baby with coronal craniosynostosis need surgery?
Not every case is managed the same way, but many babies with craniosynostosis are treated surgically. Mayo Clinic states that mild craniosynostosis may not need surgery, but for most babies surgery is the main treatment. (Mayo Clinic)
What surgery is commonly used for coronal craniosynostosis?
Fronto-orbital advancement is commonly used for coronal craniosynostosis, especially when the forehead and upper eye socket need reshaping. Seattle Children’s states that FOA is often recommended for babies with fused metopic or coronal sutures and involves reshaping the forehead and upper eye sockets. (Seattle Children's)
What is fronto-orbital advancement?
Fronto-orbital advancement is an open surgery that reshapes and moves the forehead and upper eye-socket bones. It is used to improve skull shape, create space, and improve protection and contour around the eyes. (Seattle Children's)
Is endoscopic surgery an option for coronal craniosynostosis?
Sometimes, in selected young babies. Seattle Children’s says endoscopic strip craniectomy may be an option for babies 4 months or younger with a single fused metopic or coronal suture, but there is a greater chance of needing open surgery later. (Seattle Children's)
Will my baby need a helmet?
A helmet is usually used after endoscopic surgery, but usually not after open surgery. Mayo Clinic states that helmet therapy is used after minimally invasive surgery, while open surgery usually does not require a helmet afterward. (Mayo Clinic)
When should I ask for a craniofacial referral?
Ask for referral if your baby has one-sided forehead flattening, one eye that looks higher or larger, brow asymmetry, nose deviation, facial asymmetry, a suspected coronal suture ridge, unclear diagnosis, or worsening head shape.
What symptoms should I report urgently?
Report repeated vomiting, poor feeding, unusual sleepiness, a persistently bulging soft spot, developmental regression, seizure-like activity, breathing trouble, or rapidly worsening head or facial asymmetry. Johns Hopkins lists several signs that may be associated with elevated intracranial pressure, including a full or bulging fontanelle, sleepiness, high-pitched cry, poor feeding, projectile vomiting, and developmental delays. (Johns Hopkins Medicine)
Suggested External Sources for the Published Blog
Use these at the bottom of the published article as a “Sources” section:
CDC — Craniosynostosis Best for: coronal and bicoronal definitions, anterior plagiocephaly, flattened forehead, raised eye socket, nose deviation, brachycephaly, diagnosis signs, and general treatment overview. (CDC)
Mayo Clinic — Craniosynostosis: Symptoms and Causes / Diagnosis and TreatmentBest for: coronal craniosynostosis head-shape pattern, one-sided forehead flattening and opposite-side bulging, eye-socket rise, nose turning, bicoronal short-wide head shape, diagnosis, imaging, surgery goals, endoscopic surgery, open surgery, and helmet therapy. (Mayo Clinic)
Seattle Children’s — Craniosynostosis Best for: coronal suture overview, diagnosis process, genetic testing considerations, treatment by suture and age, fronto-orbital advancement for metopic/coronal synostosis, endoscopic option in selected young babies, and craniofacial team care. (Seattle Children's)
Children’s Hospital of Philadelphia — Craniosynostosis Caregiver HandbookBest for: parent-facing descriptions of unicoronal and bicoronal head-shape patterns, coronal suture anatomy, forehead and brow flattening, eye appearance, nose bending, bicoronal wide/tall head shape, and surgery goals.
HealthyChildren.org / American Academy of Pediatrics — Positional Skull Deformities and Infant Head Shape GuidanceBest for: differentiating positional plagiocephaly from craniosynostosis, explaining back-of-head flattening, forward ear shift, tummy time, and why craniosynostosis needs early surgical specialist referral. (HealthyChildren.org)
St. Louis Children’s Hospital — Unicoronal Craniosynostosis Parent GuideBest for: practical parent comparison of open and endoscopic repair, helmet expectations, post-op follow-up, and how unicoronal synostosis affects forehead, brow, and eye shape.
Europe PMC / Ophthalmic Manifestations of Unilateral Coronal SynostosisBest for: eye-related concerns in unilateral coronal synostosis, including orbital asymmetry, harlequin deformity, astigmatism, strabismus, and amblyopia. (Europe PMC)