Bright Intracranial Lesions on Diffusion-weighted Images: A Pictorial Review.
10.3348/jkrs.2006.55.1.21
- Author:
Dae Seob CHOI
1
Author Information
1. Department of Diagnostic Radiology and Gyeongsang Institute of Health Science, Gyeongsang National University College of Medicine, Korea. choids@nongae.gsnu.ac.kr
- Publication Type:Case Report
- Keywords:
Brain;
Magnetic resonance (MR), diffusion study
- MeSH:
Brain;
Brain Abscess;
Carbon Monoxide;
Demyelinating Diseases;
Diffuse Axonal Injury;
Diffusion;
Empyema, Subdural;
Encephalitis, Herpes Simplex;
Hematoma;
Hepatolenticular Degeneration;
Hypoxia-Ischemia, Brain;
Infarction;
Multiple Sclerosis;
Posterior Leukoencephalopathy Syndrome;
Water;
Wernicke Encephalopathy
- From:Journal of the Korean Radiological Society
2006;55(1):21-32
- CountryRepublic of Korea
- Language:English
-
Abstract:
Diffusion-weighted imaging (DWI) is a MR sequence that is used to evaluate the rate of microscopic water diffusion within the tissues. The ability to measure the rate of water diffusion is important because this is frequently altered in various disease processes. Generally, the lesions with restricted water diffusion show bright intensity on DWI, but the lesions without restricted water diffusion can also show bright intensity on DWI, which is called the "T2 shine through effect". With DWI, we can sensitively detect hyperacute infarction (within 6 hours after symptom onset), and this is difficult to detect with using CT and the conventional MR sequences. The acute and subacute lesions of hypoxic-ischemic encephalopathy and carbon monoxide intoxication also show bright intensity on the DWI. The other diseases that can show bright intensity on the DWI include acute and subacute diffuse axonal injury lesions, hyperacute and late subacute hematomas, cerebral abscess, subdural empyema, acute herpes encephalitis, various tumors and such degenerative and demyelinating diseases as multiple sclerosis, posterior reversible encephalopathy syndrome, Wilson's disease and Wernicke's encephalopathy.
