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From the Departments of Neurology (Drs. Baird and Schlaug) and Radiology (Drs. Lövblad and Edelman), Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, MA; and the Division of Diagnostics and Therapeutics (Dr. Warach), National Institute for Neurological Disorders and Stroke, Bethesda, MD.
Address correspondence and reprint requests to Dr. Alison E. Baird, Department of Neurology, DANA 779, East Campus, Beth Israel Deaconess Medical Center, Boston, MA 02215; e-mail: abaird{at}caregroup.harvard.edu
OBJECTIVE: To determine the frequency and etiologic significance of multiple acute ischemic lesions in stroke.
BACKGROUND: Although patients may have more than one stroke during the course of their lives, acute ischemic stroke is usually thought of as a single event. Using diffusion-weighted imaging (DWI), an MRI technique that detects ischemic injury within minutes after onset, we have often observed multiple acute ischemic lesions.
METHODS: The MRI scans of 59 consecutively studied patients were reviewed to determine the frequency and etiologic significance of multiple acute ischemic lesions on DWI.
RESULTS: Multiple acute ischemic lesions were present in 10 (17%) of 59 patients. The lesions usually occurred within one major circulation (anterior or posterior), but in two patients (3%), lesions occurred in both cerebral hemispheres or in the anterior and the posterior circulations. The lesions often were small and resulted from presumed multiple emboli or the break-up of an embolus. Two patients had internal carotid artery occlusive disease and four had a cardiac or aortic source. In the other four patients the source was not determined. Lesions larger than 1 cm in diameter progressed to infarction, but some smaller lesions were not seen on follow-up T2-weighted imaging.
CONCLUSIONS: Multiple acute stroke lesions on DWI are common and could be caused by multiple emboli or the breakup of an embolus. In some cases it might become possible to make early inferences concerning the stroke mechanism that could be of use for immediately directing the clinical work-up and treatment of the patient.
Key words: Ischemic stroke—Cerebrovascular disorders—Cerebral embolism
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