Newly published Italian research using doppler ultrasound finds:
Significant differences between the jugular cross sectional areas before and after head rotation were observed only in the MS patients for the IJVs with wall collapse. There was a strong association between the CCSVI scores and the complexity of jugular morphological types. Wall miopragia (dysfunction) was mainly observed in MS patients with SP (59.3%) and PP (70.0%) clinical forms, compared to RR (48.3%) forms (p = 0.015).
http://www.biomedcentral.com/1471-2377/13/162/abstract


Cross-sectional area variations of internal jugular veins during supine head rotation in...
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Normally, chronic cerebrospinal venous insufficiency (CCSVI) has been studied using echo-colour Doppler (ECD). Subjects are examined in the supine and sitting positions, in accordance with a static protocol without rotation of the head. A dynamic approach, to assess venous sizes with different degre...