Emissary veins connect the veins outside the cranium with the intracranial venous sinuses. These structures are more commonly found in children, and not all of the various emissary veins are identified in every individual (Eckley 1903). These veins serve an important function of equalizing intracranial pressure and can act as safety valves during cerebral congestion or in patients with lesions of the neck or skull such as obstruction of the internal jugular veins (Eckley 1903; Boyd 1930; Braun and Tournade 1977; Williams et al. 1989; Curé et al. 1994; Louis Jr. et al. 2009). The foramina for these vessels tend to be larger during childhood (Williams et al. 1989) and may communicate with the diploic veins (Curé et al. 1994). Louis Jr. et al. (2009) found that emissary veins act as the primary outflow route for venous drainage in the upright position and may serve to cool venous blood circulating through the head.