Azygos anterior cerebral artery
Left temporal headaches, EEG focus.
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Both A1 segments from anterior cerebral arteries form one unique trunk called azygos artery.
Azygos anterior cerebral artery is an uncommon to rare variant seen in which the two A1 segments of the anterior cerebral artery (ACA) join to form a single trunk. As a result no anterior communicating artery is present.
It is important to be aware that this variant is associated with numerous cerebral malformations and with berry aneurysms.