PMC9256017_01
CT scan demonstrating subarachnoid hemorrhage in the basal cistern, predominantly on the left side.
2188-4226-9-0183-g001.jpg
PMC9256017_01_2188-4226-9-0183-g001.jpg
g001
Computed tomography (CT) revealed subarachnoid hemorrhage (SAH) in the basal cistern (Fig. 1).
Three-dimensional CT angiograms showing an aneurysm (white arrow) located at the bifurcation of the A1 segment of the left anterior cerebral artery (ACA) and the anomalous artery originating from the A1 segment (white arrowhead) (A, inferior view). The anomalous artery has coursed toward the interhemispheric fissure (arrows) (B, lateral oblique view). The diameter of the anomalous artery was similar to that of the left pericallosal artery.
2188-4226-9-0183-g002.jpg
PMC9256017_01_2188-4226-9-0183-g002.jpg
g002
Three-dimensional CT angiography has demonstrated an aneurysm with a major diameter of 2.8 mm, which was located at the bifurcation where the anomalous artery, running along with the left pericallosal artery, originated from the A1 segment of the left ACA (Fig. 2A). The diameter of the left pericallosal artery was noted to be smaller than that of the contralateral pericallosal artery (Fig. 2B).
Intraoperative photograph showing an aneurysm located at the bifurcation of the left A1 segment of the anterior cerebral artery (white arrow) and the anomalous artery running toward the interhemispheric fissure (white arrowhead). The aneurysm projected downward and was attached to the left optic nerve.
2188-4226-9-0183-g003.jpg
PMC9256017_01_2188-4226-9-0183-g003.jpg
g003
The aneurysm projected downward and was attached to the left optic nerve (Fig. 3).
Lateral view of the left common carotid artery angiogram showing that the anomalous artery originated from the A1 segment, ran parallel to the ipsilateral pericallosal artery, branched into the front-orbital artery (black dotted arrows) and the frontopolar artery (black arrow), and terminated as the anterior internal frontal arteries (white arrow).
2188-4226-9-0183-g004.jpg
PMC9256017_01_2188-4226-9-0183-g004.jpg
g004
Angiography via arterial catheterization demonstrated that the anomalous artery branched into the frontopolar artery and the fronto-orbital artery and terminated as the anterior internal frontal arteries (Fig. 4).