Tuberous sclerosis (TOO-bur-iss skluh-ROE-sis) is a condition that causes the growth
of noncancerous (benign) tumors. This happens when cells grow out of control and divide
more than they should.
The tumors caused by tuberous sclerosis are called hamartomas
(ham-ar-TOE-muhs). Hamartomas can grow in many parts of the body. They mostly affect
the skin, brain,
kidneys, heart, eyes, and lungs.
Tuberous sclerosis is also called tuberous sclerosis complex (or TSC).
What Are the Signs & Symptoms of Tuberous Sclerosis?
Tuberous sclerosis symptoms can range from mild to severe. Some children have only
mild skin changes, such as pale patches, thickened skin, or a facial rash that looks
Symptoms often depend on where the tumors are:
Brain: Hamartomas in the brain
can cause seizures, developmental delay, anxiety,
intellectual disability, ADHD,
behavior problems, and autism.
About half of kids with tuberous sclerosis have intellectual disabilities.
Kidneys: Hamartomas in the kidneys
can cause problems with how they work and even lead to kidney failure.
Heart: Hamartomas can block blood flow or change the heart's rhythm.
Heart hamartomas usually
get smaller as a child grows.
Lungs: Hamartomas can cause coughing,
trouble breathing, or a buildup of fluid around the lung.
Girls tend to have more serious lung problems than boys, but these do not become a
problem until adulthood.
Early signs that a child has tuberous sclerosis often include:
developmental delay (walking, talking, or other new skills happen later than in
Sometimes, doctors suspect TSC before birth if a mother's ultrasound
shows the baby has a heart tumor (called a rhabdomyoma).
What Causes Tuberous Sclerosis?
Tuberous sclerosis can be inherited or happen randomly:
Inherited. Most cases of tuberous sclerosis are due to a genetic
mutation (a change in a person's DNA) in one of two genes, TSC1 or TSC2. A baby will
be born with tuberous sclerosis if the child inherits a TS gene from either parent.
Randomly. In other cases, both parents of a child with tuberous
sclerosis have normal DNA (no TS gene). This is called a new or spontaneous mutation.
How Is Tuberous Sclerosis Diagnosed?
Most cases of tuberous sclerosis are found when a child sees a doctor after a seizure.
Doctors usually diagnose TSC based on skin changes and other symptoms. They also might
order these imaging tests:
Children who have very mild symptoms might not be diagnosed until the teen years
If a pregnant woman has tuberous sclerosis or a TS gene runs in the family, prenatal tests might
show whether the fetus (unborn baby) has the TS gene.
How Is Tuberous Sclerosis Treated?
There is no cure for tuberous sclerosis. But many of its symptoms get better with
treatment. Tuberous sclerosis complex is a lifelong condition that can affect one
or many parts of the body. So, kids who have it can need care from many specialists,
neurologists for brain-related symptoms
nephrologists or urologists for kidney problems
dermatologists for skin issues
pulmonologists for lung problems
ophthalmologists for eye problems
psychiatrists or psychologists for learning, behavior, or emotional
Depending on where the tumors are and if they cause problems:
A surgeon can remove tumors in the heart, brain, or kidney.
Doctors might block or reduce the flow of blood to kidney growths. Sometimes,
medicine can shrink them. Someone with severe kidney problems might need
(use of an artificial kidney machine) or a kidney
tumors of the kidneys, lungs, and other organs that are getting bigger
Ongoing, regular medical care for tuberous sclerosis is important. Doctors will
watch for tumor growth and see how treatment is working. An MRI scan of the head and
a CT or MRI scan of the belly every 1–3 years is normal for a child with tuberous
Early diagnosis can help most kids with tuberous sclerosis get the care they need
to lead active, independent lives. For most, tuberous sclerosis won't affect their
If your child has tuberous sclerosis, you don't have to go it alone. Look for an
online or local support group, like the Tuberous Sclerosis Alliance, where you can
connect with other families dealing with tuberous sclerosis. They can share what works
for them and be a lot of help if you feel overwhelmed. Ask your child's doctor for