CT perfusion maps demonstrated reduced cerebral blood flow (CBF) and volume (CBV), and increased mean transit time (MTT) and Tmax in the ischemic region. The relative size of the infarct core and penumbra, and the potential recuperation ratio (PRR) was also calculated, demonstrating a relatively low value (40%), an indicator of unfavorable prognosis. However, based on the good ASPECTS score (8) and mCTA collateral score (4), the patient was nevertheless selected and admitted for urgent mechanical thrombectomy which was successfully performed.