PT  - JOURNAL ARTICLE
AU  - Paul Y-K. Wang
AU  - Peter B. Barker
AU  - Robert J. Wityk
AU  - Aziz M. Uluğ
AU  - Peter C. M. van Zijl
AU  - Norman J. Beauchamp, Jr
TI  - Diffusion-Negative Stroke: A Report of Two Cases
DP  - 1999 Nov 01
TA  - American Journal of Neuroradiology
PG  - 1876--1880
VI  - 20
IP  - 10
4099  - http://www.ajnr.org/content/20/10/1876.short
4100  - http://www.ajnr.org/content/20/10/1876.full
SO  - Am. J. Neuroradiol.1999 Nov 01; 20
AB  - Summary: Diffusion-weighted MR imaging is generally thought to be highly sensitive for the diagnosis of acute stroke. We report two cases of hyperacute stroke with absence of changes on diffusion-weighted images within 4 hours of symptom onset. Follow-up studies, performed 4 days later, showed infarction in regions compatible with the clinical presentation and (in one case) with the initial perfusion deficit. These cases indicate that normal findings on diffusion-weighted images in patients with suspected cerebral ischemia do not rule out impending infarction.