Figure 2From: Cross-sectional area variations of internal jugular veins during supine head rotation in multiple sclerosis patients with chronic cerebrospinal venous insufficiency: a prospective diagnostic controlled study with duplex ultrasound investigation A normal IJV. Progressive reduction of the vessel diameter proceeding from J1 point (12.7 mm) to J3 (5.1 mm) and passing through J2 (6.3 mm).Back to article page