Port Wine Stains: Laser Treatment and Sturge-Weber

Overview / Definition Port wine stains (PWS) are congenital vascular malformations that present as flat, macular lesions with a color ranging from pink to deep red. They are caused by a capillary malformation and occur due to abnormal development of blood vessels during embryogenesis. PWS can be isolated or associated with syndromes such as Sturge-Weber syndrome, which can have significant implications for the affected individual. Epidemiology PWS occurs in approximately 1 in 300 to 1 in 500 live births, with no significant gender predilection. These lesions can appear anywhere on the body but are most commonly found on the face and neck. The incidence may vary based on geographical and ethnic factors, but overall, they are one of the most common types of vascular birthmarks. Pathophysiology / Mechanism The pathophysiology of PWS involves a failure of normal vascular remodeling during embryogenesis, leading to a persistent and enlarged capillary network. The lesions are primarily composed of dilated capillaries and venules with a sparse inflammatory infiltrate. The presence of the GNAQ gene mutation has been implicated in the pathogenesis of PWS, particularly in cases associated with Sturge-Weber syndrome. Clinical Presentation PWS typically presents as well-defined, flat, and pink to red lesions that may darken over time, becoming a deep purplish color. The lesions do not blanch with pressure. Important points regarding clinical presentation include: Location: Most commonly found on the face, often following the distribution of the trigeminal nerve. Associated features: In some cases, especially when located on the forehead or scalp, PWS may be associated with neurological abnormalities as seen in Sturge-Weber syndrome. Age of onset: Present at birth and typically do not regress spontaneously. Diagnosis / Workup The diagnosis of PWS is primarily clinical, based on the characteristic appearance of the lesions. In cases where Sturge-Weber syndrome is suspected, furth