Background
Unilateral nevoid telangiectasia (UNT) is a cutaneous condition consisting of congenital or acquired patches of superficial telangiectases in a unilateral linear distribution. Described in 1899 by Blaschko, its segmental pattern suggests a mechanism of somatic mosaicism apparent early in life or unmasked in states of relative estrogen excess, such as that in pregnancy or in chronic liver disease.
Also see Ataxia-Telangiectasia and Generalized Essential Telangiectasia.