Medical Oncologist
CION Cancer Clinics
Cowden syndrome in children: signs, checks and support | CION Cancer Clinics
In children, Cowden syndrome usually shows as a large head, sometimes with delayed development or autism. Cancer in childhood is uncommon, but thyroid lumps can start young, so thyroid checks often begin in childhood. This page explains the signs parents may notice, what care looks like as a child grows, when a child should be tested and which symptoms need a prompt check. At CION Cancer Clinics, our oncologists plan screening and care for families with an inherited cancer syndrome, explained in plain words.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- How does Cowden syndrome show up in a child?
- Which signs appear in childhood?
- What care looks like as your child grows
- The terms used about children with a PTEN fault
- What is usually harmless, and what needs a prompt check
- What this page cannot tell you
- Four worries parents share, and what is actually true
- Common questions about Cowden syndrome in children
The short answer
How does Cowden syndrome show up in a child?
Usually as a large head, sometimes with delayed development or autism. Cancer in childhood is uncommon. The main childhood concern is the thyroid, which is why thyroid checks often start young. Most of the skin signs and cancer risks that define the syndrome in adults appear much later.
The large head is often the first clue
Most children with a PTEN fault have a head size well above average, often noticed on a growth chart in the first year. On its own this is common and usually means nothing. Combined with developmental delay, a family history of thyroid or breast problems, or lumps under the skin, it becomes a reason to think about PTEN.
Development and autism
Some children with a PTEN fault have speech delay, learning difficulties or autism. Many do not. Early support through speech and occupational therapy helps, whatever the cause.
Why children are often diagnosed first
Paediatricians now test for PTEN in some children with autism and a large head. When the result is positive, a parent is often found to carry the same fault without ever having been diagnosed.
What parents may notice
Which signs appear in childhood?
No child has all of these. Many signs are harmless and are only important as part of a pattern.
Head size
A head that measures well above the usual range for age, growing steadily along its own line on the chart. Children with Cowden syndrome are otherwise usually normal in height and weight.
Development and behaviour
Late speech, late walking, learning difficulties or features of autism. These are assessed like any other child's, and the child gets the same therapies and school support.
Lumps, bumps and marks
These tend to be linked with the related condition called Bannayan-Riley-Ruvalcaba syndrome, which is part of the same group.
Things doctors look for
- Soft fatty lumps under the skin
- Freckles on the penis in boys
- Unusual blood vessel growths
Bowel and thyroid
Polyps in the bowel can cause bleeding or tummy pain. Thyroid lumps can start in childhood, and thyroid cancer, though uncommon, has been found in children with PTEN faults.
Not sure whether this applies to you?
Ask an oncologistThrough childhood
What care looks like as your child grows
-
At diagnosis
A genetic counsellor explains the result and offers testing to the parents. Brothers and sisters may also be offered testing, since the childhood thyroid checks give a reason to know.
-
A full baseline check
A paediatrician examines the skin, measures head size and growth, and arranges a development assessment if there are any concerns.
-
Regular thyroid ultrasound
This is the main cancer check in childhood. Your team will set when it starts and how often it repeats.
-
School years
Therapies and school support continue as needed. Any bleeding from the bowel, new lumps or changing moles are reported rather than watched.
-
Teenage years
The young person starts learning about their own condition. Adult checks for the breast, womb, kidney and bowel are planned for later, and the move to adult care is prepared.
Words you will hear
The terms used about children with a PTEN fault
- Macrocephaly
- A head that is larger than most children of the same age and sex. It is measured with a tape around the head.
- Head circumference centile
- Where your child's head size sits on a growth chart compared with other children. A very high centile is what doctors notice.
- Autism spectrum disorder
- Differences in communication, social interaction and behaviour. PTEN is one of several known genetic causes.
- Bannayan-Riley-Ruvalcaba syndrome
- A related condition from the same gene, usually recognised in childhood. It is managed the same way as Cowden syndrome.
- Lipoma
- A soft, harmless lump of fat under the skin. Many people with PTEN faults have several.
- Hamartomatous polyp
- A harmless overgrowth inside the bowel. It can bleed, but it is not cancer.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Side by side
What is usually harmless, and what needs a prompt check
Usually harmless
Needs a prompt check
A large head growing steadily along its line
Head growth that speeds up, or headaches with vomiting
Soft fatty lumps that stay the same
A lump that grows quickly or becomes painful
Small thyroid lumps seen on a routine scan
A neck lump you can feel growing, or a hoarse voice
An occasional mild tummy ache
Blood in the stool, or severe tummy pain with vomiting
Being straight with you
What this page cannot tell you
It cannot tell you whether your child has Cowden syndrome. A large head is common, and so are speech delay and fatty lumps. A paediatrician and a clinical geneticist need to look at the whole child and the whole family before a PTEN test is ordered.
It cannot interpret your child's result
What your child's specific variant means is a question for the counsellor who ordered the test. If the result says variant of uncertain significance, it is not a diagnosis and should not start a surveillance programme on its own.
Who this does not apply to
Most children with a large head, or with autism, do not have a PTEN fault. Testing is usually for children whose head size is very high on the chart together with other features, or who have a parent or sibling with a confirmed fault.
Commonly believed
Four worries parents share, and what is actually true
"My child will get cancer while still young."
Cancer in childhood is uncommon in Cowden syndrome. Most of the raised risks belong to adult life. Thyroid checks in childhood are there to catch the one risk that can appear early.
"The autism was caused by something we did."
When a PTEN fault is found, it explains the development differences. Nothing the parents did caused them, and early therapy helps whatever the cause.
"A big head is just a family trait, so there is nothing to check."
Often that is true. But a large head that also runs in a parent with thyroid lumps or skin bumps can itself be a sign of a shared PTEN fault.
"We should hide the diagnosis from the child."
Children cope better with simple, honest explanations that grow with them. They will need to own their care as adults, and learning gradually makes that easier.
Questions we are asked
Common questions about Cowden syndrome in children
Should my child be tested if I have a PTEN fault?
Usually yes, and in childhood. Unlike syndromes that only matter in adult life, Cowden syndrome can need thyroid checks and development support from childhood. A counsellor will discuss timing and explain what a result would mean for your child.
My son has autism and a large head. Should he be tested?
Many paediatric guidelines suggest considering a PTEN test in that situation. Ask your paediatrician or developmental specialist. A positive result would add thyroid checks and would mean the family should be offered testing too.
Can my child play sport and go to school normally?
Yes. Cowden syndrome does not limit ordinary play, sport or schooling. Children who have development or learning differences may benefit from extra support at school, which is arranged in the usual way.
Do the fatty lumps need to be removed?
Usually not. They are harmless and are removed only if they cause pain, press on something, grow quickly or look unusual. Surgery in children with PTEN faults is planned carefully, because lumps can come back.
Where can we get development support in Telangana?
Your paediatrician can refer you to speech, occupational and behaviour therapy. District Early Intervention Centres under the Rashtriya Bal Swasthya Karyakram programme also assess and support children with developmental delay.
Will thyroid scans harm my child?
No. Thyroid checks use ultrasound, which uses sound waves and no radiation. The scan is painless and quick, and a parent can usually stay with the child throughout.
How do we explain this to our child?
Start simply, with the idea that some parts of the body need extra check-ups. Add detail as your child grows and asks questions. A counsellor can suggest words that suit your child's age and understanding, in Telugu if that is easier.
Whom should we see first?
Your paediatrician, who can arrange a genetics referral and the first thyroid scan. If you are unsure where to begin, call the CION helpline and describe your child's signs and any family history. Someone will point you to the right clinic.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- GeneReviews (NCBI) — PTEN Hamartoma Tumor Syndrome
- MedlinePlus Genetics — PTEN gene
- MedlinePlus Genetics — Cowden syndrome
- National Cancer Institute — Childhood Thyroid Cancer Treatment (PDQ) - Patient Version
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Cowden syndrome explainedThe condition as a whole, for parents new to itBannayan-Riley-Ruvalcaba and related conditionsThe childhood form of the same gene faultWhen a child should decide for themselvesWhy PTEN is one of the syndromes tested in childhoodSurveillance programmes for predisposed childrenHow childhood check programmes are organised
Talk to us
Worried your child may have a PTEN fault?
Tell us your child's signs and any family history of thyroid or breast problems. We will explain whether a genetics referral makes sense and help arrange it. One helpline serves every CION centre.