PMC5903132_01
Digital subtraction angiography (a) obtained 5 years before admission. Magnetic resonance imaging (b-f) obtained on admission. a Left carotid angiography displays a large intracranial aneurysm (arrowhead; maximum diameter 21 mm) on the left internal carotid artery. b Diffusion-weighted imaging reveals a hyperintense signal on the left anterior choroidal artery territory (arrowhead). c-e Time-of-flight magnetic resonance angiography demonstrated poor visibility of the middle and anterior cerebral arteries and the inferior part of the giant aneurysm (maximum diameter 28 mm), suggesting aneurysm thrombosis (arrowheads).
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F1
Five years previously, he had had a large intracranial aneurysm on the left internal carotid artery (ICA) (Fig. 1a). Diffusion-weighted imaging (DWI) revealed a hyperintense signal on the left anterior choroidal artery territory (Fig. 1b). Time-of-flight magnetic resonance angiography (MRA) demonstrated poor visibility of the middle and anterior cerebral arteries and the inferior part of the giant aneurysm, suggesting aneurysm thrombosis (Fig. 1c-e).
Arterial spin labeling obtained on admission. Arterial spin labeling signals increased in the giant aneurysm (arrowheads) and decreased in the left hemisphere.
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F2
ASL signal increased in the giant aneurysm and decreased in the left hemisphere (Fig. 2a, b).