Familial multiple nevi flammei

Familial multiple nevi flammei, also known as familial multiple port-wine stains or familial capillary malformations, is a rare inherited vascular disorder characterized by the presence of multiple nevi flammei (port-wine stains) in several members of a family. Nevi flammei are flat, pink-to-red cutaneous vascular malformations caused by dilated capillaries in the dermis. In this familial form, affected individuals typically present at birth with multiple port-wine stains distributed across various body regions, including the face, trunk, and extremities. The lesions are generally more numerous than in sporadic cases and may vary in size and intensity of color among affected family members. The condition primarily affects the skin and its underlying capillary vasculature. Unlike syndromic port-wine stains (such as those seen in Sturge-Weber syndrome or Klippel-Trenaunay syndrome), familial multiple nevi flammei is generally not associated with underlying neurological, ophthalmological, or skeletal abnormalities, though careful clinical evaluation is recommended to exclude associated features. The port-wine stains tend to persist throughout life and may darken or thicken with age. Treatment is primarily symptomatic and cosmetic. Pulsed dye laser therapy is the most commonly used intervention to lighten the appearance of port-wine stains, though results can be variable and multiple treatment sessions are typically required. Complete clearance is often not achievable. Genetic counseling is recommended for affected families. The condition has been linked in some families to mutations in the RASA1 gene, which is also associated with capillary malformation-arteriovenous malformation syndrome (CM-AVM), highlighting the importance of thorough vascular evaluation in affected individuals.

Common questions about Familial multiple nevi flammei