Port-wine stain / capillary malformation
Naevus flammeus; capillary malformation; CM; port wine birthmark
Port-wine stain is a congenital capillary malformation present at birth as a flat red to pink-purple patch that persists lifelong (unlike infantile haemangioma which involutes). Histologically composed of ectatic capillaries in the upper and mid dermis; pathogenesis involves a somatic mosaic GNAQ R183Q mutation in a subset of endothelial cells. Affects approximately 0.3% of infants. Over years to decades, the patch may darken, hypertrophy and develop discrete vascular nodules (Klippel-Trenaunay-like) — driving cosmetic and psychosocial morbidity. Pulsed-dye laser is the established first-line therapy. A facial V1 distribution PWS warrants screening for Sturge-Weber syndrome.
Clinical features
- Present at birth as a flat, well-demarcated, pink to red-purple patch.
- Often unilateral, frequently respecting the midline; can be segmental or extensive.
- Common sites — face (~ 65%), but any body site.
- Lifelong persistence — unlike infantile haemangioma; never spontaneously involutes.
- Darkens, thickens and may become nodular ("cobblestoning") in adulthood — particularly in centrofacial / V2 distribution.
- Family history uncommon; mostly sporadic.
Sturge-Weber and other associations
- Facial PWS in the V1 trigeminal distribution (forehead + upper eyelid) — risk of Sturge-Weber syndrome:
- Leptomeningeal angiomatosis → seizures, hemiparesis, intellectual disability.
- Glaucoma — same side as PWS.
- Risk highest with extensive V1 involvement; involvement of V2 / V3 alone does not warrant SWS workup.
- Refer for ophthalmology assessment (glaucoma screening) and consider MRI brain in V1 PWS.
- Klippel-Trenaunay syndrome — extensive limb PWS + lymphovenous malformation + soft-tissue / bone overgrowth.
- Parkes Weber syndrome — high-flow AV malformation + limb hypertrophy + capillary stain.
Management
- Pulsed-dye laser (PDL 585/595 nm) — established first-line. Multiple sessions (5–15+) at 6–8 week intervals. Best results in childhood; partial response is typical.
- Other lasers — alexandrite, Nd:YAG, IPL for resistant or nodular lesions; KTP for thicker lesions.
- Camouflage make-up — Veil, Dermablend; substantial psychosocial benefit.
- Surgical excision / debulking — for hypertrophic / nodular adult lesions causing functional or cosmetic impairment.
- Topical sirolimus — emerging adjuvant to PDL for incomplete response (off-label).
- Counsel about lifelong nature and partial laser response; manage expectations.
- Refer to specialist vascular anomaly clinic for complex / extensive disease.
References
- Shirley MD et al. Sturge-Weber syndrome and port-wine stains caused by somatic mutation in GNAQ. N Engl J Med; 2013.
- Chapas AM, Eickhorst K, Geronemus RG. Efficacy of early treatment of facial port wine stains in newborns: a review. Lasers Surg Med; 2007.
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