Chronic cerebrospinal venous insufficiency (CCSVI), has been recently hypothesized to be the possible cause of multiple sclerosis (MS). It can be easily assessed using Doppler sonography by evaluating the extra cerebral venous haemodynamics with changes in posture and to assess the morphology of the venous system in patient with MS, yet it may not be as simple as to think of the complex disease MS solely to be the result of a simple venous outflow obstruction. The aim of this study is to compare the hemodynamics and the morphology of the internal jugular veins using colour-Doppler and B mode sonography in multiple sclerosis patients(MS) .,to evaluate the prevalence of chronic cerebrospinal venous insufficiency (CCSVI) in patients with multiple sclerosis (MS).