PMC2734918_01
Imaging findings on the day of onset. (a) Computed tomography shows very thin subarachnoid hemorrhage on the left side of the interhemispheric fissure (arrow). (b) Magnetic resonance imaging (diffusion image) reveals infarction of the left medial frontal region (arrow). (c) Left internal cerebral artery angiography reveals stenosis (string sign) of the A2 segment (arrow).
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Computed tomography (CT) showed thin subarachnoid hemorrhage (SAH) on the left side of the interhemispheric fissure (Fisher's group 2) (Figure 1(a)). Magnetic resonance imaging (MRI) revealed left frontal lobe infarction (Figure 1(b)), and cerebral angiography indicated stenosis (string sign) of the distal left anterior cerebral artery (A2 segment) (Figure 1(c)).
(a) Magnetic resonance imaging (FLAIR sequence) about one month after the onset shows infarction of the medial part of the left frontal lobe. (b) Left internal cerebral artery angiogram displays severe stenosis of the A2 segment (arrow). (c) About 9 months after the onset, magnetic resonance angiography reveals recanalization of the left A2 segment.
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A2 segment (Figure 2(a)). Angiography also revealed severe stenosis (string sign) of the left A2 segment (Figure 2(b)). Six months later, magnetic resonance angiography (MRA) showed recanalization of the left A2 segment (Figure 2(c)).