unilateral nevoid telangiectasia unilateral nevoid telangiectasia unilateral nevoid telangiectasia presents with fine thread veins, typically over a segment of skin supplied by a particular nerve on one side of the body. it most frequently involves the trigeminal and c3 and c4 or adjacent areas. unilateral nevoid telangiectasiaspecialtydermatology the condition was named in 1970 by victor selmanowitz.