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Fig 2. A 44-year-old man with right-sided hemiparesis attributed to cerebrovascular vasospasm occurring 9 days after SAH consecutive to a ruptured aneurysm of the anterior communicating artery, treated by surgical clipping. DSA (A) showed moderate vasospasm on M1 segment of left MCA and focal severe vasospasm on the M2 segment (arrowheads). These findings were confirmed by MIP MSCTA reconstruction (B) and volume-rendered MSCTA reconstruction (C). Perfusion CT performed during the same CT session revealed an increase in MTT (D) and a decrease in rCBF (E), with slight increase of rCBV (F). This pattern of perfusion alterations corresponds to a reversible ischemic lesion consecutive to vasospasm. The patient was then treated by a local intra-arterial nimodipine infusion and a balloon angioplasty of the left M1 segment.
