Azygos anterior cerebral artery
MRI Brain and MRA
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There is a single trunk forming the A2 segment of ACAs. The left A1 ACA is hypoplastic and dives a hypoplastic A2 which ends below the level of genu of corpus callosum.
This case demonstrates a rare anatomical variant called Azygos anterior cerebral artery (azygos-ACA) characterised by a common trunk in the A2 segment (above the anterior communicating artery) 1.