Figure 2

Illustration depicting the predominant veins and sinuses involved in the craniocervical venous outflow. Venous narrowing is depicted at locations of interest in chronic cerebrospinal venous insufficiency. The figure was reproduced with permission from Lazzaro MA, Zaidat OO, Mueller-Kronast N, Taqi MA, Woo D. Endovascular therapy for chronic cerebrospinal venous insufficiency in multiple sclerosis. Front Neurol 2011, 2:44.