Port-Wine Stain and Sturge-Weber Syndrome
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Direct answer
A port-wine stain is a congenital capillary malformation of the skin that is present at birth, is flat, pink to purple, and does not regress. When it involves the forehead and upper eyelid in the ophthalmic V1 distribution, it may signal Sturge-Weber syndrome, which carries leptomeningeal angioma, seizures and glaucoma. Pulsed dye laser is the standard treatment for port-wine stains and works best when started early.
What you must remember
- Port-wine stain: a flat, pink to purple capillary malformation that grows with the child and does not involute, unlike infantile haemangioma.
- Sturge-Weber syndrome: a facial port-wine stain with ipsilateral leptomeningeal angioma; a somatic GNAQ mutation (R183Q) underlies the vascular malformation in most cases.
- Highest-risk site: V1 (ophthalmic) involvement, especially bilateral or upper-eyelid extension; V2 and V3 stains alone carry a lower risk.
- Neurology: focal seizures, hemiparesis, developmental delay and gyriform (tram-track) calcification on CT, typically in the parieto-occipital cortex.
- Eye: glaucoma from raised episcleral venous pressure and choroidal haemangioma, so intraocular pressure needs regular checks.
- Look-alikes: Klippel-Trenaunay syndrome has a port-wine stain with limb overgrowth and varicosities; Parkes Weber syndrome has an arteriovenous fistula.
- Treatment: pulsed dye laser at 585 to 595 nm for port-wine stains; Nd:YAG laser is used for deeper or resistant lesions.
A screening pathway for facial port-wine stains
Any facial port-wine stain should prompt a check of the V1 territory, because the risk of neurological and ocular involvement is concentrated there. Follow the steps in order and refer early.
- Map the distribution: document which trigeminal divisions are involved, and note bilateral or upper-eyelid extension.
- Refer for neuroimaging: contrast MRI looks for leptomeningeal enhancement, and CT shows the calcification.
- Screen the eye: ophthalmology review for glaucoma and choroidal haemangioma, with intraocular pressure measured early.
- Treat seizures: early neurology input for focal seizures, which are often the first sign.
- Start laser therapy: pulsed dye laser started in childhood improves colour and gives better results than delayed treatment.
- Support the family: explain the lifelong nature of the condition and the psychological impact of visible facial marks.
Where screening and laser questions go wrong
Vignettes on port-wine stains test whether you know the distribution that matters and the treatment that works.
- Trap: assuming every port-wine stain means Sturge-Weber syndrome. Correct: only facial stains in V1, particularly with other features, prompt neuro-ophthalmic workup; isolated trunk or limb stains do not.
- Trap: choosing oral propranolol as for infantile haemangioma. Correct: port-wine stains do not involute, and pulsed dye laser is the treatment of choice.
- Trap: ignoring glaucoma because the child has normal vision. Correct: glaucoma can present early in Sturge-Weber syndrome, so pressure checks are needed.
- Trap: mixing up Klippel-Trenaunay with Sturge-Weber. Correct: Klippel-Trenaunay has limb overgrowth and varicosities, while Sturge-Weber has a V1 stain and leptomeningeal angioma.
Frequently asked questions
How does a port-wine stain differ from an infantile haemangioma?
A port-wine stain is present at birth, flat and does not regress, whereas an infantile haemangioma usually appears in the first weeks, proliferates and then involutes. Port-wine stains need pulsed dye laser rather than systemic propranolol.
Which port-wine stain distribution carries the highest risk of Sturge-Weber syndrome?
Involvement of the ophthalmic (V1) division of the trigeminal nerve carries the highest risk of Sturge-Weber syndrome, particularly when the stain is bilateral or extends over the upper eyelid. Stains limited to V2 or V3 carry a much lower risk.
What imaging finding is characteristic of Sturge-Weber syndrome?
Gyriform, or tram-track, calcification on CT in the parieto-occipital cortex is characteristic of Sturge-Weber syndrome, and contrast MRI shows leptomeningeal enhancement. The brain changes lie on the same side as the facial stain, so seizures and hemiparesis appear on the opposite side of the body.
Which laser is the treatment of choice for port-wine stain?
Pulsed dye laser, typically at 585 to 595 nm, is the treatment of choice for port-wine stains because oxyhaemoglobin absorbs its light. Starting early in childhood gives better lightening, and several sessions are usually needed.
What ocular complication is most important in Sturge-Weber syndrome?
Glaucoma, caused by raised episcleral venous pressure, is the most important ocular complication of Sturge-Weber syndrome and can cause blindness if untreated. Choroidal haemangioma also occurs, so intraocular pressure should be checked regularly from childhood.