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Stroke. 1998;29:133-136

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(Stroke. 1998;29:133-136.)
© 1998 American Heart Association, Inc.

Original Contributions

Diffusion-Weighted MRI in Acute Subcortical Infarction

Michael B. Singer, MD; June Chong, MD; Dongfeng Lu, PhD; Wouter J. Schonewille, MD; Stanley Tuhrim, MD; Scott W. Atlas, MD

From the Departments of Radiology (M.B.S., J.C., D.L., S.W.A.) and Neurology (W.J.S., S.T.), Mount Sinai School of Medicine, New York, NY.

Background and Purpose—Conventional imaging lacks sensitivity and specificity for the detection of early subcortical cerebral infarction. The purposes of our study were (1) to determine the accuracy of diffusion-weighted (DW) MRI for early subcortical infarction and (2) to determine the efficacy of DW MRI for differentiating acute from nonacute subcortical infarctions when conventional MR demonstrates multiple infarctions.

Methods—Thirty-nine patients with clinically diagnosed acute subcortical infarction and 17 control subjects were imaged with both conventional and DW MRI from 7 hours to 4 days (mean, 2.0 days) after onset of symptoms. All images were read blinded to specific clinical findings. In all cases, the precise neuroanatomic locations of lesions were noted. These lesions were subsequently correlated by an experienced stroke neurologist to determine whether their locations correlated to the patients' symptoms.

Results—The accuracy of DW MRI for acute subcortical infarction was 94.6%. In 4 of 39 cases, the acute infarction was not detected on conventional MRI. In 24 of 39 cases, conventional MRI showed the acute lesion as well as multiple other subcortical lesions. In each of these 24 cases, the DW MRI showed a single lesion to be acute, and in all 24 cases, that lesion corresponded to the patients' acute symptoms.

Conclusions—DW MRI has very high accuracy for acute subcortical infarction and can differentiate acute from nonacute lesions. These data have significant implications in guiding patient management and patient selection for clinical trials.


Key Words: cerebral infarction • diagnostic imaging • magnetic resonance imaging • stroke, acute




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