Table 1.

Color Doppler ultrasound criteria of FMD

1. Morphological criteria:

Segmental string-of-beads pattern with alternating regions of lumen narrowing and vessel dilatation

2. Localization:

Distal extracranial part of ICA (VA).

3. Hemodynamics (optional):

Direct and/or indirect criteria of stenosis (in distal extracranial part of ICA / VA).