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An 80-year-old man with acute onset of right upper limb weakness

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  • Contributors M-SH took care of this patient and wrote the manuscript. Y-TT and S-YH obtained the correct diagnosis and performed prompt treatment for this patient. Y-YH helped in CT image and clinical data collection. All authors helped to interpret findings and review the drafts of the manuscript.

  • Competing interests None.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; internally peer reviewed.