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. 2018 Aug 21;9:666. doi: 10.3389/fneur.2018.00666

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Copyright © 2018 Luo, Wang, Gao, Krings and Jiao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Unenhanced CT (A) demonstrates recent ischemia in a deep watershed pattern, CTA (B) in a coronal view shows a high degree MCA stenosis that is confirmed on conventional angiography (C). Note the excellent collateral network from the leptomeningeal collaterals from the ACA territory toward the MCA territory. (D) Demonstrates the CT Perfusion parameters – relative cerebral blood flow (rCBF) and — volume (rCBV) that are both still normal whereas the Time to maximum contrast (Tmax) and the mean transit time (MTT) are significantly delayed over the right hemisphere indicating hypoperfusion.