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a CTA (VRT 3D reconstructions) reveals aplasia of the left A1 segment of the anterior cerebral artery in a patient with an Acom aneurysm. b Digital subtraction angiography (AP view) of the right ICA verifies the presence of a small Acom aneurysm. Both A2 segments are opacified from this single injection. c Digital subtraction angiography (AP view) of the left ICA. The left A1 segment is absent
