Vascular disorders.

Cutaneous vascular abnormalities are a feature of many syndromes with multisystemic involvement. The most common associations are hypertrophy of underlying soft tissue and bone, as in the Klippel-Trenaunay-Weber and Sturge-Weber syndromes, visceral vascular lesions with hemorrhage, as in hereditary hemorrhagic telangiectasia and blue rubber bleb nevus syndrome, and neurologic alterations, as in Fabry's disease, ataxia-telangiectasia, and the Sturge-Weber syndrome.