Images obtained in an 83-year-old man with cerebral hyperperfusion after carotid stent placement. Images obtained in an 83-year-old man with cerebral hyperperfusion.

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Presentation transcript:

Images obtained in an 83-year-old man with cerebral hyperperfusion after carotid stent placement. Images obtained in an 83-year-old man with cerebral hyperperfusion after carotid stent placement. A, Postprocedural carotid angiogram shows satisfactory dilatation of the right internal carotid artery with normalized distal blood flow. B, 99mTc-HMPAO SPECT scan obtained immediately after stent placement shows hyperperfusion in the right MCA territory, with an asymmetry index of 120.3% (arrow). C, 123I-IMP SPECT scan in the resting state obtained 7 days after stent placement shows prolonged hyperperfusion in the territory, with an asymmetry index of 108.1%. D, 123I-IMP SPECT scan obtained with an ACZ challenge 7 days after stent placement shows a slightly improved but still impaired cerebrovascular reserve of 13.4% in the right cerebral hemisphere. Yasuhiko Kaku et al. AJNR Am J Neuroradiol 2004;25:1403-1408 ©2004 by American Society of Neuroradiology