TSC Global Awareness Day

Tuberous Sclerosis Complex (TSC) is a genetic disorder that causes noncancerous tumors, or growths, to form in many parts of the body, most often the brain, kidneys, heart, skin, eyes, and lungs.

Symptoms vary widely, from mild skin changes to seizures, developmental delays, and organ complications. Many people are diagnosed in childhood, but some are not recognized until adulthood.

Because tumors and related issues can change over time, lifelong follow up with specialists is usually recommended to monitor brain activity, kidney size and function, lung health, heart rhythm, and skin lesions.  

TSC is usually caused by a mutation in either the TSC1 or TSC2 gene, which normally helps control cell growth.

The condition follows an autosomal dominant pattern, which means a person only needs one altered copy of the gene to have TSC.

Around one third of people inherit the mutation from a parent who has TSC, while about two thirds have a new (de novo) mutation with no prior family history.

Because the mutation can be passed to children, families often meet with a genetic counselor to discuss genetic testing, recurrence risks, and reproductive options. 

Early signs of TSC can appear before or soon after birth and often involve the skin, brain, or heart.

Babies may have pale patches on the skin called hypomelanotic macules, facial angiofibromas that develop later in childhood, or small growths under or around the nails.

Some infants develop heart tumors called cardiac rhabdomyomas that can be seen on prenatal ultrasound. Seizures, including infantile spasms, developmental delays, or difficulty meeting milestones can also be early clues.

Because these signs can be subtle on their own, doctors often use a combination of physical examination, brain imaging, heart tests, and genetic testing to confirm a diagnosis.  

There is no cure for TSC, but many of its complications can be managed with a combination of medicines, procedures, and regular monitoring.

Seizures are often treated with anti-seizure medications and, in some cases, specialized diets or surgery.

Drugs that inhibit the mTOR pathway, such as everolimus, can shrink certain TSC-related tumors in the brain and kidneys and may help control seizures in some individuals.

Other treatments can include laser or topical therapies for skin lesions, procedures to treat kidney tumors at risk of bleeding, and supportive services such as physical, occupational, or speech therapy.

Care is typically coordinated through a multidisciplinary team that may include neurology, nephrology, dermatology, cardiology, pulmonology, and behavioral specialists.  

Many people with TSC experience neurodevelopmental or behavioral challenges, although the type and severity differ widely.

These can include intellectual disability, autism spectrum disorder, attention deficit hyperactivity disorder (ADHD), anxiety, depression, and difficulties with social communication or executive functioning.

Seizures, sleep problems, and pain can make these issues worse. Early developmental screenings, behavioral assessments, and access to special education services or therapies can improve long term outcomes.

Mental health support for both the individual and family is also considered an important part of comprehensive TSC care.  

TSC is considered a rare disorder, with estimates suggesting it affects roughly 1 in 6,000 to 1 in 10,000 people worldwide.

Underdiagnosis can occur because symptoms can be mild, appear at different ages, or resemble more common conditions.

For example, seizures may be labeled as generalized epilepsy, or skin changes might be mistaken for ordinary birthmarks or acne.

Some adults learn they have TSC only after a child is diagnosed or when they are evaluated for kidney, lung, or heart findings.

Greater awareness among healthcare providers and the use of standardized diagnostic criteria and genetic testing have improved recognition, but delayed diagnosis is still common.  

People with TSC are usually advised to follow a structured surveillance plan throughout life, because tumors or related complications can appear or change over time.

International guidelines recommend periodic brain MRI scans to check for growths, kidney imaging and blood tests to monitor kidney size and function, regular blood pressure checks, lung function tests and imaging in adolescents and adults, and echocardiograms or ECGs in children with heart involvement.

Skin and eye exams, dental checks, and ongoing evaluations of learning, behavior, and mental health are also part of routine care. The exact schedule is tailored to the person’s age, sex, and specific organ involvement.