Skip to main content
Advertisement

Main menu

  • Home
  • Content
    • Current Issue
    • Publication Preview--Ahead of Print
    • Past Issue Archive
    • Case of the Week Archive
    • Classic Case Archive
    • Case of the Month Archive
    • COVID-19 Content and Resources
  • For Authors
  • About Us
    • About AJNR
    • Editors
    • American Society of Neuroradiology
  • Submit a Manuscript
  • Podcasts
    • Subscribe on iTunes
    • Subscribe on Stitcher
  • More
    • Subscribers
    • Permissions
    • Advertisers
    • Alerts
    • Feedback
  • Other Publications
    • ajnr

User menu

  • Subscribe
  • Alerts
  • Log in

Search

  • Advanced search
American Journal of Neuroradiology
American Journal of Neuroradiology

American Journal of Neuroradiology

  • Subscribe
  • Alerts
  • Log in

Advanced Search

  • Home
  • Content
    • Current Issue
    • Publication Preview--Ahead of Print
    • Past Issue Archive
    • Case of the Week Archive
    • Classic Case Archive
    • Case of the Month Archive
    • COVID-19 Content and Resources
  • For Authors
  • About Us
    • About AJNR
    • Editors
    • American Society of Neuroradiology
  • Submit a Manuscript
  • Podcasts
    • Subscribe on iTunes
    • Subscribe on Stitcher
  • More
    • Subscribers
    • Permissions
    • Advertisers
    • Alerts
    • Feedback
  • Follow AJNR on Twitter
  • Visit AJNR on Facebook
  • Follow AJNR on Instagram
  • Join AJNR on LinkedIn
  • RSS Feeds
LetterLetter

In Re: Reversible Ischemia Determined by Xenon-Enhanced CT after 90 Minutes of Complete Basilar Artery Occlusion

Michael H Lev and Robert H Ackerman
American Journal of Neuroradiology November 1999, 20 (10) 2023;
Michael H Lev
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Robert H Ackerman
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • Article
  • Info & Metrics
  • References
  • PDF
Loading

In their case report, Reversible ischemia determined by xenon-enhanced CT after 90 minutes of complete basilar artery occlusion, Levy et al describe a patient with acute basilar artery occlusion whose right occipital lobe remained viable after reperfusion, despite 90 minutes with blood flow to this region reduced to 6 mL /100 g per minute (1). This finding—the rationale for their report—suggests a lower threshold for reversible ischemia at 90 minutes (at least in the posterior circulation) than the 10–12 mL /100 g per minute that is generally accepted.

The basis for their diagnosis of reversible ischemia, however, is the finding of resolution of hypoattenuation in the medial right occipital lobe on a CT scan done 12 days after stroke, as compared with a scan obtained 2 days after stroke. The authors do not provide a late CT scan (2 to 3 months after ictus), an MR scan, or an autopsy report that documents that cavitation has not subsequently evolved. Such documentation is necessary to prove that the normal attenuation coefficients found at 12 days were because of preservation of normal tissue rather than the result of a more likely phenomenon—fogging of an evolving infarction (2–4).

Infarct fogging, the apparent normalization of the CT scan hypodensity associated with an acute stroke, typically occurs between the second and third weeks after infarction. It is believed to be caused by the capillary proliferation and macrophage invasion into infarcted brain parenchyma that occurs after the resolution of acute edema but before the development of tissue cavitation.

References

  1. ↵
    Levy EI, Scarrow AM, Kanal E, Rubin G, Yonas H, Kirby L, Reversible ischemia determined by xenon-Enhanced CT after 90 minutes of complete basilar artery occlusion. AJNR Am J Neuroradiol 1998;19:1943-1946
    Abstract
  2. ↵
    Skriver EB, Olsen TS, Transient disappearance of cerebral infarcts on CT scan, the so-called fogging effect. Neuroradiology 1981;22:61-65
    CrossRefPubMed
  3. Becker H, Desch H, Hacker H, Pencz A, CT fogging effect with ischemic cerebral infarcts. Neuroradiology 1979;18:185-192
    CrossRefPubMed
  4. Ackerman RH, Lev MH, Alpert NM, et al. Infarct fogging on CT: prevalence, features, and PET/MRI correlates. In: Proceedings of the 28th Annual Meeting of the American Society of Neuroradiology; 1990; Los Angeles, CA
  • Copyright © American Society of Neuroradiology
PreviousNext
Back to top

In this issue

American Journal of Neuroradiology
Vol. 20, Issue 10
1 Nov 1999
  • Table of Contents
  • Index by author
Advertisement
Print
Download PDF
Email Article

Thank you for your interest in spreading the word on American Journal of Neuroradiology.

NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address.

Enter multiple addresses on separate lines or separate them with commas.
In Re: Reversible Ischemia Determined by Xenon-Enhanced CT after 90 Minutes of Complete Basilar Artery Occlusion
(Your Name) has sent you a message from American Journal of Neuroradiology
(Your Name) thought you would like to see the American Journal of Neuroradiology web site.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Citation Tools
In Re: Reversible Ischemia Determined by Xenon-Enhanced CT after 90 Minutes of Complete Basilar Artery Occlusion
Michael H Lev, Robert H Ackerman
American Journal of Neuroradiology Nov 1999, 20 (10) 2023;

Citation Manager Formats

  • BibTeX
  • Bookends
  • EasyBib
  • EndNote (tagged)
  • EndNote 8 (xml)
  • Medlars
  • Mendeley
  • Papers
  • RefWorks Tagged
  • Ref Manager
  • RIS
  • Zotero
Share
In Re: Reversible Ischemia Determined by Xenon-Enhanced CT after 90 Minutes of Complete Basilar Artery Occlusion
Michael H Lev, Robert H Ackerman
American Journal of Neuroradiology Nov 1999, 20 (10) 2023;
del.icio.us logo Digg logo Reddit logo Twitter logo CiteULike logo Facebook logo Google logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One

Jump to section

  • Article
    • References
  • Info & Metrics
  • References
  • PDF

Related Articles

  • No related articles found.
  • PubMed
  • Google Scholar

Cited By...

  • No citing articles found.
  • Crossref
  • Google Scholar

This article has not yet been cited by articles in journals that are participating in Crossref Cited-by Linking.

More in this TOC Section

  • Fair Performance of CT in Diagnosing Unilateral Vocal Fold Paralysis
  • Reply:
  • Regarding “Altered Blood Flow in the Ophthalmic and Internal Carotid Arteries in Patients with Age-Related Macular Degeneration Measured Using Noncontrast MR Angiography at 7T”
Show more Letters

Similar Articles

Advertisement

News and Updates

  • Lucien Levy Best Research Article Award
  • Thanks to our 2022 Distinguished Reviewers
  • Press Releases

Resources

  • Evidence-Based Medicine Level Guide
  • How to Participate in a Tweet Chat
  • AJNR Podcast Archive
  • Ideas for Publicizing Your Research
  • Librarian Resources
  • Terms and Conditions

Opportunities

  • Share Your Art in Perspectives
  • Get Peer Review Credit from Publons
  • Moderate a Tweet Chat

American Society of Neuroradiology

  • Neurographics
  • ASNR Annual Meeting
  • Fellowship Portal
  • Position Statements

© 2023 by the American Society of Neuroradiology | Print ISSN: 0195-6108 Online ISSN: 1936-959X

Powered by HighWire