Coats Plus resource center
How to spot Coats Plus
Notice changes. Ask questions. Get the right help. Clear examples for parents, with practical guidance on when to see a doctor.
First, the basics
What is Coats Plus?
Coats Plus is a very rare inherited condition that damages the body’s smallest blood vessels. It usually shows up as a pattern: eye problems, brain changes, and problems elsewhere in the body, such as bleeding in the gut, fragile bones or slow growth.
Many children are born early or small for their age, and the first signs often appear in infancy or early childhood. Because it’s so rare, it’s often first mistaken for something more common, such as an unusual form of retinopathy of prematurity.
You can’t confirm it from a photograph or a symptom list. Doctors put together eye exams, brain imaging, medical history and genetic testing. Most cases are found in children, but adult diagnoses have also been reported. Read the full explanation →
Sources: NIH condition overview · Published adult presentation
What to look for
Changes you might notice.
These changes have many possible causes. One sign does not mean Coats Plus, and not every affected person has every feature.
Something seems different about their sight.
Vision may worsen, or the pupil—the normally dark center of the eye—may look white or yellow. Some eye changes are painless and are found at an eye examination.
Next step: An unusual white/yellow pupil needs an urgent eye assessment, even if your child otherwise seems well. New vision changes also need urgent advice. Sudden inability to see needs emergency care.
Eye signs and urgency sources ↓Abnormal retinal blood vessels
One of the most distinctive early features of Coats Plus is abnormal development and function of the tiny blood vessels in the retina. These vessels may become dilated, twisted, leaky, or fail to develop normally in the peripheral retina. In premature infants, these abnormalities can resemble retinopathy of prematurity (ROP) or familial exudative vitreoretinopathy (FEVR), potentially delaying the correct diagnosis.
What to look for: Retinal abnormalities that appear unusual for typical ROP, continue progressing despite treatment, or occur alongside growth restriction or neurological abnormalities. Retinal abnormalities may be present even when parents notice no obvious vision problems.
Next step: A pediatric retinal specialist may recommend widefield fluorescein angiography to examine blood vessels at the outer edges of the retina. Young children may require examination under anesthesia.
Familiar skills are becoming harder.
Tell the doctor about changes in movement, balance, learning or development, or a loss of skills your child previously had. Seizures can also occur.
Next step: Contact your child’s clinician promptly about lost skills or concerning changes. A first seizure needs emergency help; follow an existing seizure plan if your child has one.
Development and seizure sources ↓Neurological changes
Coats Plus can progressively affect the brain and nervous system. Symptoms may include seizures, tremors, balance difficulties, abnormal muscle tone, impaired coordination, or deterioration in previously acquired motor and cognitive abilities. These changes may be associated with leukodystrophy (white-matter abnormalities) and other structural changes within the brain.
What to look for: New seizures, unexplained shaking or tremors, changes in walking or coordination, increasing difficulty performing familiar activities, or loss of previously acquired skills.
Next step: Contact your child’s physician promptly about new neurological symptoms or developmental regression. A first seizure requires urgent medical evaluation.
On brain imaging: calcifications, cysts, and white-matter abnormalities
Brain imaging can reveal a characteristic combination of abnormalities: intracranial calcifications (abnormal calcium deposits, particularly in deep brain structures), brain cysts (fluid-filled spaces that may develop or enlarge over time), and leukodystrophy / leukoencephalopathy (white-matter abnormalities). Calcifications in young children can sometimes resemble findings associated with congenital infections, which can complicate diagnosis.
What to look for: These abnormalities generally cannot be identified by parents through observation alone. They are detected through medical imaging.
Next step: CT scans are particularly useful for identifying calcifications, while MRI gives greater detail about cysts and white-matter abnormalities. Genetic evaluation should be considered when characteristic findings occur together.
Growth or bone strength needs a closer look.
Slow growth and fragile bones have been reported. A fracture may follow a relatively minor injury.
Next step: Bring growth records and fracture details to the pediatrician. A suspected new broken bone needs urgent assessment—do not wait for a rare-disease appointment.
Growth and fracture sources ↓Before birth: growth restriction, prematurity, or low birth weight
One of the earliest signs of Coats Plus may appear before a child is born. Intrauterine growth restriction (IUGR), in which a baby grows more slowly than expected during pregnancy, is a recognized feature of the disorder. Premature birth and very low birth weight have also been reported. Low amniotic fluid and placental abnormalities have been observed in affected families, although they are not yet established as characteristic features in published medical literature.
What to look for: A baby measuring unusually small during pregnancy, falling behind expected growth measurements, or being born prematurely at a significantly low weight.
Next step: Discuss unexplained growth restriction with your obstetrician or pediatrician, particularly when other unusual findings are present.
Slow growth during infancy and childhood
Children with Coats Plus may continue to experience growth difficulties after birth. Some remain significantly smaller than expected for their age or gradually fall below their previous growth trajectory.
What to look for: Persistent poor growth, unusually slow weight gain, short stature, or a declining position on standard pediatric growth charts.
Next step: Discuss persistent growth concerns with your pediatrician, especially when accompanied by retinal abnormalities or other unexplained medical findings.
Unusual paleness, tiredness or bleeding.
Anemia can cause paleness and fatigue. Bleeding in the digestive tract is another reported complication.
Next step: Discuss persistent unexplained paleness or tiredness with a clinician. Signs of digestive bleeding need medical help right away; bleeding with collapse or severe illness needs emergency care.
Bleeding guidance and sources ↓Fragile bones, anemia, or gastrointestinal bleeding
Additional complications may become apparent as the disease progresses, although their timing and severity vary. Bone abnormalities: reduced bone density (osteopenia) may increase the risk of fractures after relatively minor injuries. Anemia: low red blood cell levels may cause unusual paleness, fatigue, or weakness. Gastrointestinal bleeding: abnormal blood vessels in the digestive tract can cause recurrent or potentially serious bleeding. Other reported features include sparse hair, premature graying, and nail abnormalities.
What to look for: Repeated fractures after minor falls, unexplained fatigue or paleness, black or tarry stools, or vomiting blood.
Next step: Discuss persistent unexplained symptoms with your child’s physician. Black, tarry stools or vomiting blood require immediate medical assessment.
The pattern matters. You do not have to connect every dot.
A retinal blood-vessel problem together with unexplained findings elsewhere in the body may prompt doctors to consider Coats Plus. Some important changes are only found through examinations, scans or laboratory tests.
Coats disease and Coats Plus are different diagnoses. An eye diagnosis alone does not establish Coats Plus. Bring concerns to your treating clinician rather than trying to match a fixed number of symptoms.
Understand the differences →How is Coats Plus confirmed?
Diagnosis relies on clinical findings and genetic testing, particularly analysis of the CTC1 and STN1 genes, with consideration of other relevant genes. Importantly, a normal or near-normal telomere length test does not exclude Coats Plus. Early recognition can help families access appropriate specialists, monitoring, supportive care and genetic counseling.
Medical disclaimer: This information is intended for education and awareness. It does not replace professional medical evaluation. The presence of one or more symptoms does not necessarily indicate Coats Plus.
When to see a doctor
How quickly should we get help?
These are general safety rules, not a Coats Plus emergency protocol. Use your local emergency number and follow any individual emergency plan.
Do not wait.
- Sudden inability to see, or sudden severe eye pain.
- A first seizure, a seizure lasting more than five minutes, repeated seizures close together, or trouble breathing or waking afterward.
- Sudden weakness on one side of the body, new confusion, or a sudden severe headache.
- Vomiting blood or coffee-ground-like material, or black, tarry stools, even if your child seems otherwise OK.
- Any bleeding with fainting, confusion, breathing difficulty, collapse or other signs of shock.
- An injured limb that is visibly bent or deformed, an open injury with visible bone, or a suspected fracture with signs of shock.
Seek emergency care. Do not wait for a genetic test, questionnaire or foundation response.
Get medical advice right away.
- A white or yellow pupil, or an unusual pupil reflection in photos.
- New blurred or double vision, flashing lights, or a moving dark shadow.
- New tremor or a sudden change in how your child moves.
- A suspected new fracture.
- Fever in a child known to have low white blood cell counts or bone marrow failure.
- Unusual bruising or bleeding in a child known to have low platelets.
- If your child has Coats Plus: new or worsening paleness or tiredness, which can be a sign of slow internal bleeding.
Contact an urgent medical or eye-care service. Explain exactly what you have noticed.
Arrange a timely appointment.
- Loss of skills or concerning developmental changes.
- Persistent changes in movement or balance.
- Growth concerns or repeated fractures.
- Persistent, unexplained paleness or tiredness.
- A baby born small or premature whose retinopathy of prematurity (ROP) looks unusual or does not respond to treatment. Ask about a widefield fluorescein angiogram and genetic testing that includes the CTC1 gene.
- Brain calcifications on a scan when common causes such as infection have been ruled out. Ask about genetic causes.
Ask how soon your child should be seen. If changes are sudden or your child is severely unwell, seek urgent help.
Guidance: NHS eye guidance · CDC seizure and development guidance · NIH digestive bleeding guidance · NHS fracture guidance
Your next conversation
Tell the doctor what has changed.
A clear concern is enough to start.
You could say: “We’ve noticed a change in our child’s vision, and there are other concerns we’d like considered together.”
If your child has eye findings plus other problems, such as seizures, tremor, slow growth or bleeding, you can ask:
- “Could this be a genetic condition affecting blood vessels, such as Coats Plus?”
- “Should my child have a widefield fluorescein angiogram to look at the edge of the retina?”
- “Would brain imaging (CT or MRI) help?”
- “Should we see a clinical genetics team, and would testing include the CTC1 and STN1 genes?”
Your clinician decides which tests are right. These questions help make sure the possibility is considered.
Bring what you already have.
- A short timeline: what changed, when it started, and whether it is getting worse.
- Relevant eye reports, growth records, fracture details and previous test results.
- A current medication list and known family genetic results.
- Your main questions and the effect on everyday life.
- Birth history: how early your child was born, birth weight, and any NICU stay or ROP eye exam reports.
- Any brain scan reports and infection test results.
Share personal records through your clinical team’s approved private channel.
Where this guidance comes from
Read the original sources.
The condition overview describes reported features. The eye, seizure, development, bleeding and fracture resources explain general reasons to seek care.
- NIH / MedlinePlus Genetics: Coats Plus syndrome ↗ — Established clinical features. This older overview does not include the full current gene spectrum; see our research library for newer studies.
- Great Ormond Street Hospital: Coats disease ↗ — Eye signs; this describes isolated Coats disease, a different diagnosis. NHS: why a white pupil needs prompt assessment ↗. NHS: urgent and emergency vision changes ↗.
- CDC: seizure first aid and when to call emergency services ↗. CDC: acting on developmental concerns ↗.
- NHS: broken-leg guidance ↗ — General injury guidance. Slow growth and bone fragility are described in the NIH condition overview above.
- NIH / NIDDK: digestive bleeding symptoms and when to seek help ↗ — General bleeding guidance, not a Coats Plus-specific protocol.
Where would you like to go next?
Care & Family Support
Plan appointments, coordinate care, and find practical support for daily life.
Open the guide →RESOURCE GUIDEUnderstanding Coats Plus
The condition, genes, affected body systems, and common questions explained.
Open the guide →Editorial status: Educational draft for foundation and independent clinical review. This information is not a diagnosis or an individual treatment plan. Sources, medical copy, external links and community details still require review before public launch.
Back to the top ↑