An infant presents with a large, flat vascular malformation over the left face and scalp. The mother notes that her other child was born with a capillary hemangioma on his arm and asks if this is the same thing. You explain that this vascular malformation is different, and that you will want to monitor him for another condition.
a) Sturge-Weber syndrome
b) Klippel-Trenaunay syndrome
c) Neurofibromatosis type 1
d) Hereditary hemorrhagic telangiectasia