Sturge-Weber syndrome

Sturge-Weber syndrome (SWS) is a sporadic neurocutaneous condition caused by a post-zygotic, somatic mosaic variant, most often in GNAQ. It can involve capillary malformations of the skin, leptomeningeal blood vessels of the brain, and the eye in different combinations. A facial port-wine birthmark alone does not establish brain or eye involvement, and the absence of a visible birthmark does not exclude SWS.1

Urgent safety and early referral

Follow the person's seizure action plan. Seek emergency care for a first seizure, a seizure that reaches the plan's emergency threshold, repeated seizures without recovery, breathing difficulty or color change, new one-sided weakness, a sudden substantial change in alertness or function, or an acute severe headache with neurologic symptoms. New weakness after a seizure can be transient, but it still needs prompt clinical assessment rather than being assumed to be the person's baseline.1

Eye pain or redness, a cloudy or enlarged cornea, marked light sensitivity, persistent tearing, or an acute vision change needs urgent eye assessment. Glaucoma and amblyopia can cause preventable vision loss. Children with a high-risk facial port-wine birthmark, particularly involving the forehead or upper eyelid, need baseline pediatric ophthalmology and neurology review with follow-up set by those teams; referral should not wait for symptoms.1

Spectrum, diagnosis, and uncertainty

Possible manifestations include a facial capillary malformation, glaucoma or other ocular vascular changes, seizures, headaches, stroke-like episodes, visual-field loss, and weakness on one side. Language, learning, attention, behavior, and mobility may be affected when the brain is involved, but the profile and course vary considerably.1

The diagnosis is based on the clinical pattern, neurologic and ophthalmologic examination, and appropriately selected imaging. For new neurologic symptoms or suspected brain involvement, specialists may use optimized brain MRI with and without contrast. MRI can be falsely reassuring early in infancy, while routine repeat imaging is not generally useful when established SWS and neurocognitive function are stable; timing therefore belongs with a specialist who can weigh symptoms, age, sedation, and whether the result would change care.1

Because the causal variant is mosaic, testing blood can be negative even when affected tissue carries the variant. Molecular testing may clarify selected cases but does not replace clinical assessment. SWS is generally not inherited from a parent; genetics consultation can address an individual result and recurrence questions.2

Coordinated care

Care is directed to the organs and functions involved. Neurology or an epilepsy team can manage seizures and consider surgical evaluation when seizures remain disabling despite appropriate medication. Ophthalmology monitors pressure and vision. Dermatology can discuss goals and options for a port-wine birthmark without treating appearance as a medical obligation. Rehabilitation, school, mental-health, pain, and headache support should respond to the person's current priorities and function.1

A sudden change in speech, movement, vision, behavior, pain, or school performance deserves assessment for seizures, medication effects, headache, sleep, mood, vision, or another illness before it is attributed to SWS.

Communication, feeding, and AAC

Communication needs can reflect language or learning differences, hearing or vision, visual-field loss, hemiparesis, seizures, fatigue, or medication effects. Assessment should document how the person expresses choices, refusal, pain, consent, social connection, and urgent needs across settings. Partners can reduce effort by allowing response time, presenting information in an accessible visual field, confirming meaning, and supporting communication during post-seizure recovery.

AAC is based on functional communication need, not the diagnosis. A multimodal system may include speech, gesture, sign, writing, objects, pictures, partner-assisted scanning, switches, or speech-generating technology. Touch, switch, eye-gaze, or voice access should be trialed rather than assigned: one-sided weakness, visual-field loss, glaucoma, positioning, fatigue, and seizure state can change what works. Provide vocabulary beyond requests, partner training, and a low-tech backup. For assessment, trials, funding, and implementation, use the AAC device acquisition guide.4

Swallowing difficulty is not an inevitable feature of SWS. Refer for feeding or swallowing assessment when there is coughing, choking, recurrent respiratory illness, prolonged or effortful meals, dehydration, weight concern, or a relevant neurologic change. Diet texture, positioning, pacing, or tube-feeding decisions require direct assessment.

Sources

1. Sabeti et al. Consensus Statement for the Management and Treatment of Sturge-Weber Syndrome: Neurology, Neuroimaging, and Ophthalmology Recommendations — risk-based referral, imaging, neurologic care, and eye surveillance (2021).
2. Mastrangelo et al. Multidisciplinary, multicenter consensus for the care of patients affected with Sturge-Weber syndrome — current multidisciplinary clinical consensus (2024).
3. Shirley et al. Sturge-Weber syndrome and port-wine stains caused by somatic mutation in GNAQ — primary evidence for somatic mosaic etiology (2013; PMID 23656586).
4. American Speech-Language-Hearing Association: Augmentative and Alternative Communication — individualized, multimodal AAC assessment.

Review boundary

This page cannot diagnose SWS, interpret imaging or molecular findings, distinguish a seizure from a stroke-like episode, or remotely assess eye pressure, swallowing, or safety. Emergencies require immediate local assessment. Imaging, medication, surgery, laser treatment, diet, equipment, and communication decisions require direct review by qualified clinicians with the person and family.