Fig 1.
Representative ASL images for each visual grade (upper row) and diffusion-weighted images showing supratentorial infarction for each case (lower row).
(A) Grade I, no demonstrable asymmetric perfusion in the cerebellum. Diffusion-weighted image in the lower row shows hyperacute infarction in the left temporal lobe (arrow). (B) Grade II, the affected right cerebellum is slightly hypointense to the unaffected left cerebellum. Hyperacute infarction is seen in the posterior limb of the left internal capsule (arrow). (C) Grade III, the affected right cerebellum is markedly hypointense to the unaffected left cerebellum. Diffusion-weighted image in the lower row demonstrates hyperacute infarction in the left frontotemporal lobe (arrow). (D) An example of circular region of interests in the cerebellum. The calculated asymmetry index was 3.7 in A, 9.5 in B, and 34.2 in C.
Table 1.
Clinical characteristics and MRI findings between CCD-positive and CCD-negative groups.
Fig 2.
A 71-year-old man with a history of sudden onset left-sided weakness.
(A) Diffusion-weighted image demonstrating hyperacute infarction in the right basal ganglia without (B) signal change on the fluid-attenuated inversion recovery image. (C) Arterial occlusion is noted in MR angiography at the right M1 (arrow). (D) ASL image of the cerebellum showing hypoperfusion in the contralateral cerebellar hemisphere (grade III and AI of 44.48).
Table 2.
Univariate linear regression analyses for asymmetric index.