These are abnormal blood vessels present where the arteries connect with the veins. [nicklauschildrens.org]

It used to be common in children during treatment of the flu or chickenpox, but thankfully the condition has become increasingly rare. [nicklauschildrens.org]

Saethre-Chotzen syndrome is one of many disorders that results in these sutures closing early and preventing the skull from growing properly. [nicklauschildrens.org]