DefinitionBy Mayo Clinic Staff
A brain lesion is an abnormality seen on a brain-imaging test, such as magnetic resonance imaging (MRI) or a computerized tomography (CT) scan. On CT or MRI scans, brain lesions appear as dark or light spots that don't look like normal brain tissue.
Usually, a brain lesion is an incidental finding unrelated to the condition or symptom that led to the imaging test in the first place.
A brain lesion may involve small to large areas of your brain, and the severity of the underlying condition may range from relatively minor to life-threatening.
Dec. 04, 2014
- Sandeman EM, et al. Incidental findings on brain MR imaging in older community-dwelling subjects are common but serious medical consequences are rare: A cohort study. PLOS One. 2013;8:e71467.
- Cole AJ. Magnetic resonance imaging changes related to acute seizure activity. http://www.uptodate.com/home. Accessed Sept. 10, 2014.
- Yilmaz U, et al. Childhood headaches and brain magnetic resonance imaging findings. European Journal of Paediatric Neurology. 2014;18:163.
- Magnetic resonance imaging (MRI). National Multiple Sclerosis Society. http://www.nationalmssociety.org/Symptoms-Diagnosis/Diagnosing-Tools/MRI. Accessed Sept. 11, 2014.
- Wilkinson JM (expert opinion). Mayo Clinic, Rochester, Minn. Sept. 22, 2014.