CHORUS

Collaborative Hypertext of Radiology

Nervous system

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carotid-vertebral artery anastomoses

• trigeminal a. (most common variant: 0.1-0.2%)
• otic a.
• hypoglossal a.
• proatlantal intersegmental a.

• ** posterior communicating a. (PCA)
  • -- normal anastomosis of carotid to BASILAR artery)

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