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Table 1 Color Doppler ultrasound criteria of FMD

From: Color Doppler imaging of cervicocephalic fibromuscular dysplasia

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).