High-resolution ultrasound evaluation of interval jugular venous valves

Although the presence of valves in the distal portion of the internal jugul ar veins has been described by anatomists and pathologists, their existence remains underscored in the medical literature. We set out to demonstrate t heir sonographic aspect and to evaluate their morphology, location and prev alence. Seventy-five cadavers were evaluated for the presence and aspect of such valves through neck dissections. Concurrent evaluation of the sonogra phic character of these structures was performed in another cohort of 75 ad ults. Valves of the distal portion of the internal jugular veins were found 93% of the cadaveric studies. Ultrasonography easily demonstrated the valv e leaflets in 87% of patients; all were observed in the distal portion of t he internal jugular (IJ) veins. Sixty percent were bilateral with the major ity of unilateral veins found on the right side. High-resolution ultrasonog raphy easily valves in the distal portion of the IJ which are present in th e great majority of persons. Their evaluation may be of use in percutaneous procedures using this venous access.