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. 2021 Jun 3;17:1745–1750. doi: 10.2147/NDT.S301870

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© 2021 Wang et al.

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Female patient, 66 years old, left limb dyskinesia for one day, getting a magnetic resonance imaging examination. (A) The diffusion-weighted imaging shows the diffusion-limited focus (black arrow) in the left blood supply region of the middle cerebral artery. (B) The minimum intensity projection-susceptibility-weighted imaging (layer thickness: 16 mm, layer spacing: 20 mm, DFOV: 20.13×23.00 mm) displays that the cortical vein and medullary vein of the right blood supply region of the middle cerebral artery is larger and thickened (white arrow) compared with the contralateral. (C) The perfusion-weighted imaging examination shows a large perfusion anomaly area in the right blood supply region of the middle cerebral artery, which is expressed as mean transit time extension (white arrow). Furthermore, its core infarction area is demonstrated as the disappearance of mean transit time. (D) In the diffusion-weighted imaging–susceptibility-weighted imaging fusion image, the red area (black arrow) is the core infarction area, and there are many thickened and increased veins (white arrow), which indicates the existence of ischemic penumbra; it is consistent with the area of penumbra displayed by the perfusion-weighted imaging (mean transit time).