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(Stroke. 2003;34:797.)
© 2003 American Heart Association, Inc.

Research Reports

Serial FLAIR Imaging After Gd-DTPA Contrast

Pitfalls in Stroke Trial Magnetic Resonance Imaging

From the Department of Diagnostic Radiology, Singapore General Hospital, Singapore.

Correspondence to Helmut Rumpel, PhD, Department of Diagnostic Radiology, Singapore General Hospital, Outram Rd, Singapore 169608. E-mail helmut.rumpel{at}pacific.net.sg

Abstract

Background— Most MRI protocols for stroke trials comprise 2 successive fluid-attenuated inversion-recovery (FLAIR) imaging acquisitions in which the first scan is done pre–Gd-DTPA contrast while the second is within the contrast clearance window.

Summary of Report— A 68-year-old male was diagnosed as having hyperacute right middle cerebral artery infarct and a subacute chronic small left occipital cortical infarct. The latter turned from hypointense to strikingly hyperintense on the second FLAIR image, resembling the picture of an acute-on-chronic infarction or hemorrhage. However, the second DWI and CT refuted either of these.

Conclusions— Image contrast using FLAIR in acute stroke trial imaging may also be affected by T1 effects of Gd-DTPA in chronic infarcts.

Key Words: contrast media • magnetic resonance imaging • stroke, acute • thrombolytic therapy

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