Table 1:

Relationship between the presence or absence of collaterals based on the degree of cross-sectional narrowing of the 108 jugular veins analyzed on each side

Collaterals PresentNo Collaterals Present
Right internal jugular vein, degree of stenosis
    None (n = 46; 42.6%)9/46 (19.6%)37/46 (80.4%)
    Moderate (n = 36; 33.3%)14/36 (38.9%)22/36 (61.1%)
    Severe (n = 26; 24.1%)14/26 (53.8%)12/26 (46.2%)
Left internal jugular vein, degree of stenosis
    None (n = 60; 55.6%)13/60 (21.7%)47/60 (78.3%)
    Moderate (n = 28; 25.9%)10/28 (35.7%)18/28 (64.3%)
    Severe (n = 20; 18.5%)11/20 (55%)9/20 (45%)