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Updated: Jun 21, 2026
Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
Diffusion-weighted imaging: not all that glitters is gold
Archit Bhatt1, Amit Masih, Heather F Grothous
1Department of Neurology and Ophthalmology and Division of Cerebrovascular Disorders, Michigan State University, East Lansing, MI 48824, USA.
Abstract:
Diffusion-weighted imaging (DWI) is a sophisticated magnetic resonance imaging (MRI) technique with rapid acquisition time and high sensitivity for depicting acute cerebral ischemia. It is currently part of the routine workup in most medical centers when ischemic stroke is in the differential diagnosis. DWI helps establish a diagnosis of acute ischemic infarct even in cases where the clinical presentation is not typical for ischemic stroke. However, contrary to popular belief, not every hyperintensity on DWI is an ischemic stroke. Consequently, DWI with high intensity signals, commonly called "positive" DWI, is sometimes misinterpreted and leads to incorrect medical management. In this report, we briefly discuss some of the essential, technical aspects of DWI and report various clinical scenarios, which may lead to "positive" DWI findings but are not ischemic strokes. Although the sensitivity of DWI for ischemic stroke is very high, the specificity is not as high, and a "positive" DWI does not exclude other diagnoses that should be considered based on each patient's clinical history and examination, and the appearance of other sequences of MRI scans.
Insights
Diffusion-weighted imaging (DWI) is a sensitive MRI technique for acute stroke. However, not all bright signals on DWI confirm stroke, necessitating careful interpretation to avoid misdiagnosis.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Diffusion-weighted imaging (DWI) is a key magnetic resonance imaging (MRI) technique for detecting acute cerebral ischemia.
- Its rapid acquisition and high sensitivity make it a standard tool in diagnosing potential ischemic stroke.
Observation:
- While DWI excels at identifying acute ischemic infarcts, even with atypical presentations, hyperintensities on DWI do not exclusively indicate stroke.
- Misinterpretation of
- positive
- DWI findings can lead to inappropriate medical management.
Findings:
- This report reviews technical aspects of DWI and presents clinical scenarios causing
- positive
- DWI signals unrelated to ischemic stroke.
- DWI demonstrates high sensitivity but lower specificity for ischemic stroke, requiring consideration of other diagnoses.
Implications:
- Clinicians must integrate DWI findings with patient history, clinical examination, and other MRI sequences.
- Accurate interpretation of DWI is crucial to differentiate ischemic stroke from other conditions, ensuring correct patient management and avoiding diagnostic errors.
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