Presentation
Recurrent headache migraine-like and associated with nausea.
Patient Data
Age: 45 years
Gender: Female
From the case:
Azygos anterior cerebral artery
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/107558/annotated_viewer_json?lang=us"}
An incidentally noted fused or join the left and right A1 segments to form a single trunk making an azygos anterior cerebral artery (rare normal variant), before branching into normal branches.
Otherwise, no evidence of abnormal signal intensity.
Case Discussion
An azygos anterior cerebral artery is an uncommon-to-rare variant of the circle of Willis where the two A1 segments of the anterior cerebral artery (ACA) join to form a single trunk. As a result, there is no anterior communicating artery.
The clinical importance of an azygos artery:
- it may be associated with a number of brain anomalies such as dysgenesis of corpus callosum and holoprosencephaly, and a predisposition to aneurysm formation
- occlusion of an azygos artery may result in infarcts of the bilateral medial frontal lobes and corpus callosum
Unable to process the form. Check for errors and try again.