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Bannayan-Riley-Ruvalcaba syndrome and the other PTEN conditions | CION Cancer Clinics
Bannayan-Riley-Ruvalcaba syndrome is a condition noticed in childhood, caused by the same PTEN gene fault that causes Cowden syndrome. Doctors now group them, with a few rarer patterns, under one name: PTEN hamartoma tumour syndrome. The label a child is given matters less than the gene result, because the gene result decides the cancer checks. This page explains how the related conditions differ and what a child's diagnosis means for the parents. At CION Cancer Clinics, our oncologists plan screening and care for families with an inherited cancer syndrome, explained in plain words.
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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
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On this page
- What is Bannayan-Riley-Ruvalcaba syndrome, and is it the same as Cowden?
- Which conditions come under the PTEN umbrella?
- How does a child end up with a PTEN diagnosis?
- The words you will meet, in plain language
- How do Cowden and BRRS usually differ?
- What this page cannot tell you
- Four things parents tell us, and what is actually true
- Common questions about BRRS and related PTEN conditions
The short answer
What is Bannayan-Riley-Ruvalcaba syndrome, and is it the same as Cowden?
Bannayan-Riley-Ruvalcaba syndrome, often shortened to BRRS, is a condition usually noticed in childhood. Most children with it carry a fault in the PTEN gene, which is the same gene behind Cowden syndrome. Doctors now treat the two as different faces of one condition rather than two separate diseases.
Why they were once given different names
The names came first and the gene came later. Cowden syndrome was described in adults with skin bumps, breast disease and thyroid problems. BRRS was described in children with a large head, soft fatty lumps and freckles in an unusual place. Once testing showed both groups carried faults in the same gene, the separate labels began to look like an accident of history. Some families even have a parent who fits Cowden and a child who fits BRRS.
The name used now
Anyone with a confirmed PTEN fault is now said to have PTEN hamartoma tumour syndrome, whatever their symptoms looked like. The umbrella name matters because it carries the cancer plan with it. A child labelled BRRS and an adult labelled Cowden are offered the same kind of lifelong checks once the fault is confirmed.
The gene result, not the old clinical label, decides which cancer checks a person needs.Under one umbrella
Which conditions come under the PTEN umbrella?
Four patterns have been linked to faults in PTEN. They overlap, and one person can drift from one pattern to another as they grow up.
Cowden syndrome
Usually recognised in adult life. It is known for small skin bumps on the face and hands, and a raised risk of breast, thyroid and womb cancer. Kidney and bowel cancers are also more common than usual.
Bannayan-Riley-Ruvalcaba syndrome
Usually recognised in a young child. The signs that lead doctors to it are different from Cowden, even though the gene is the same.
Often looks like
- A head that is larger than expected for age
- Soft fatty lumps under the skin
- Freckle-like spots on the penis in boys
- Slow development or low muscle tone
PTEN-related overgrowth
A rare pattern where one part of the body grows more than the rest, sometimes with unusual blood vessels. Some people once called Proteus or Proteus-like turned out to carry a PTEN fault. Classic Proteus syndrome itself comes from a different gene.
Autism with a large head
A small share of children with autism and an unusually large head carry a PTEN fault. For them, the test answers a question about cancer risk that nobody had thought to ask.
Not sure whether this applies to you?
Ask an oncologistHow it is usually found
How does a child end up with a PTEN diagnosis?
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A paediatrician notices the head size
Head measurements taken at routine visits keep sitting well above the usual range. Often development is also a little slow, or the child feels floppy when held.
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Other clues are looked for
The doctor checks the skin for fatty lumps and birthmarks, looks for freckles on the penis in a boy, and asks about bowel bleeding. The parents are examined too, because an adult may have quiet signs of the same condition.
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A blood test looks at PTEN
The test reads the gene and also looks for missing or extra pieces of it. A clear fault confirms the diagnosis. A normal result does not always rule it out, and the doctor will explain why.
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The parents are offered testing
Once the child's exact fault is known, each parent can be tested for that one fault. The answer tells the family whether the fault was new in the child or inherited from a parent who may need checks of their own.
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A long-term plan is written
Childhood care focuses on development, the thyroid and the skin. Adult cancer checks are added later, on the timeline your specialist sets out.
On your report
The words you will meet, in plain language
- PTEN
- A gene that works as a brake on cell growth. When one copy is faulty, some tissues grow more than they should.
- Hamartoma
- A lump made of normal tissue that has grown in a disorganised way. It is not a cancer, but people with PTEN faults tend to form many of them.
- Macrocephaly
- A head that is larger than expected for a child's age and height. On its own it is common and usually harmless.
- Lipoma
- A soft, painless lump of fat under the skin. Single lipomas are ordinary. Many of them in a young child can be a clue.
- Germline
- Present in every cell from birth, and so able to pass to children. PTEN faults in this group of conditions are germline.
- New fault
- A fault that appeared for the first time in the child and is not found in either parent. Doctors may write this as de novo.
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Side by side
How do Cowden and BRRS usually differ?
Cowden syndrome
Bannayan-Riley-Ruvalcaba syndrome
Usually recognised in adult life
Usually recognised in early childhood
Skin bumps on the face, mouth and hands
Fatty lumps and freckles on the penis
Often found after a cancer or thyroid problem
Often found before any cancer has appeared
Development is usually normal
Development is often slower than expected
Lifelong cancer checks once PTEN is confirmed
The same lifelong checks once PTEN is confirmed
Being straight with you
What this page cannot tell you
It cannot tell you whether your child has one of these conditions. A large head, a few fatty lumps or slow speech each have many ordinary explanations. Only a doctor who has examined the child, measured both parents and reviewed the test can put the pieces together.
It cannot read a PTEN report
What your specific variant means is a question for the counsellor who ordered the test. Some PTEN changes are clearly harmful, some are harmless, and some sit in between as a variant of uncertain significance. That last group should not change anyone's care until it is reclassified.
Who this does not apply to
Most children with a large head do not have a PTEN fault. Many simply take after a parent with a large head. Most adults with a single lipoma or a thyroid nodule do not have one either. Testing is for a pattern of signs, not for one finding on its own.
Evidence is still thin in places
Studies of children with PTEN faults are small, and nobody yet knows exactly how their cancer risk compares with adults diagnosed with Cowden. Experts therefore plan for the same risk until better data arrive. Development and learning support belong with your paediatric team. CION's part is the cancer-risk side, and a counsellor can explain it to you in Telugu.
Commonly believed
Four things parents tell us, and what is actually true
"BRRS is a childhood condition, so the cancer risk does not apply to us."
If a PTEN fault is confirmed, experts assume the same adult cancer risks as in Cowden syndrome. The checks simply start later, when the child is older.
"We are not related by marriage, so it cannot be genetic."
PTEN conditions need only one faulty copy, from one parent or from a new change in the child. Marriage within the family does not cause them, and marrying outside it does not prevent them.
"Neither of us is ill, so our child's fault must be new."
It may be new, but a parent can carry the same fault with only quiet signs such as a large head or a few skin bumps. Testing the parents is the only way to know.
"The lumps are cancer and should all be removed."
Hamartomas and lipomas are not cancer. They are removed only if they cause pain, bleeding or trouble with movement, and your surgeon will explain when that is worth doing.
Questions we are asked
Common questions about BRRS and related PTEN conditions
Is Bannayan-Riley-Ruvalcaba syndrome a type of cancer?
No. It is an inherited condition that causes harmless growths and some developmental differences. The concern is that the same PTEN fault raises the chance of certain cancers in adult life, which is why a long-term check plan is set up early.
Will my child have learning difficulties?
Some children with BRRS have slow development or learning difficulties, and some do not. Early assessment by a paediatrician or developmental specialist lets therapy start when it helps most. The gene result alone cannot predict how a particular child will develop.
Should both parents be tested?
Usually yes, once the child's exact fault is known. A parent who carries it needs adult cancer checks of their own. If neither parent carries it, the fault was probably new in the child, and the chance of it appearing in a brother or sister is low.
Can a child with BRRS pass it on later in life?
Yes. Each child of a person with a PTEN fault has a one in two chance of inheriting it, whichever parent it comes from. This is worth discussing with a counsellor as a young adult, well before planning a family.
My child has autism and a large head. Should we test for PTEN?
Many genetics teams do offer PTEN testing in this situation, because a positive result changes future health checks. It does not change autism care itself. Ask your child's paediatrician or a genetic counsellor whether the pattern fits.
What if the test finds no PTEN fault?
Some children who look like BRRS have no fault found. The fault may be too subtle for current tests, or the cause may be a different gene. Your doctor will decide whether to repeat or widen testing, and may keep some checks going on the basis of the signs alone.
Are the bowel polyps in BRRS dangerous?
Most are harmless hamartomas, but they can bleed or, rarely, cause a blockage. Blood in the stool or ongoing tummy pain in a child with BRRS should be reported to the doctor. Bowel checks in adult life are part of the standard PTEN plan.
Where do we start in Hyderabad or a district town?
Start with your child's paediatrician, who can refer you for genetic testing. If you already have a PTEN report, bring it and both parents' family histories to a genetic counsellor. Call the CION helpline if you are unsure who to approach first.
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)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- GeneReviews (NCBI) — PTEN Hamartoma Tumor Syndrome
- MedlinePlus Genetics — Bannayan-Riley-Ruvalcaba syndrome
- MedlinePlus Genetics — Cowden syndrome
- National Cancer Institute — Genetics of Breast and Gynecologic Cancers (PDQ) - Health Professional 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 adult side of the same condition, from the startCowden syndrome in childrenWhat childhood care looks like once PTEN is confirmedThe physical signs that lead to diagnosisThe skin, head and thyroid clues doctors look forPTEN hamartoma tumour syndrome: the umbrella termWhy one gene now carries one name
Talk to us
Has your child been given a PTEN diagnosis?
A genetic counsellor can explain what it means for your child and whether either parent should be tested. We can arrange that conversation in Telugu or English. One helpline serves every CION centre.