Conditions + Treatments

Williams Syndrome

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What is Williams syndrome?

Williams syndrome is a rare (affecting 1 in 10,000 people) developmental disorder that can affect many parts of the body, including the heart and blood vessels. Children with Williams syndrome have mild to moderate intellectual disability, distinctive facial features and an outgoing personality.

Children with Williams syndrome may have the following heart conditions:

Supravalvular aortic stenosis

  • a narrowing of the aorta, the large blood vessel that carries blood from the heart to the body 
  • compromised blood flow into the coronary arteries, which puts these children at higher risk for sudden death 
  • narrowing or underdevelopment of other parts of the aorta, including the aortic arch, which may add additional stress to the heart or compromise blood flow to the organs and tissues

Pulmonary artery stenosis

  • a blockage of blood flow from the right heart-pumping chamber (ventricle) to the lungs

Meet Chloe who has Williams syndrome

How we care for Williams syndrome

At the Boston Children’s Hospital Williams Syndrome Clinic, we have a specialized team that focuses on the diagnosis and treatment of children with Williams syndrome. This team is comprised of clinicians from a range of specialties, including cardiology, cardiac surgery, genetics, neuropsychology, behavioral psychology, psychiatry, and occupational, speech and physical therapy. Through many years of experience working with children who have Williams syndrome, we have developed safe solutions for the difficult challenges they face.

We have the experience and the readiness to care for the worst of the worst, the most complex of the complex. Our team is personally invested in finding solutions for children with Williams syndrome who have not found answers elsewhere.

Our areas of innovation for Williams syndrome

We are utilizing our vast resources within Boston Children’s Hospital and collaborating with the Williams Syndrome Association (WSA) to facilitate future studies of Williams syndrome and enhance general awareness of the condition. Through our efforts, we hope to find new ways to improve the cardiovascular health and well-being in people with Williams syndrome of all ages.

Key focus areas include:

  • advanced imaging strategies to provide early and accurate detection of the cardiovascular issues of Williams syndrome
  • advanced interventional cardiology and surgical strategies to treat aortic, coronary and pulmonary vascular abnormalities unique to Williams syndrome. 
  • a simulation algorithm to enhance the safety of general anesthesia in children with Williams syndrome
  • using intravascular ultrasound imaging to understand the arterial wall and its response to catheter intervention
  • examining the current state of healthcare delivery for patients with Williams syndrome in Massachusetts and using this information to develop optimal models of care, including transition to adulthood
  • creating a Williams syndrome registry to collect medical, surgical, diagnostic and neurodevelopmental data and a DNA repository for patients with Williams syndrome
Boston Children’s is so much more than a hospital—it’s a community of researchers, clinicians, administrators, support staff, innovators, teachers, patients and families, all working together to make the impossible possible. ”
- Sandra L. Fenwick, President and CEO

Boston Children's Hospital
300 Longwood Avenue, Boston, MA 02115
For Patients: 617-355-6000
For Referring Providers: 844-BCH-PEDS | 844-224-7337

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