Supplemental Table 1.

Proposed ultrasound criteria for detection of chronic cerebrospinal venous insufficiency.

Ultrasound Criterion	Description
I	Reflux in cervical veins
II	Reflux in deep cerebral veins
III	High-resolution B-mode evidence of proximal IJV stenosis
IV	Flow not-Doppler detectable in IJVs
V	Reverted postural control of the main cerebral venous outflow in IJVs

IJV: internal jugular veinSupplemental.