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Head CT showing periventricular white matter lesions. Leukoaraiosis is a particular abnormal change in appearance of white matter near the lateral ventricles. It is often seen in aged individuals, but sometimes in young adults. [1] [2] On MRI, leukoaraiosis changes appear as white matter hyperintensities (WMHs) in T2 FLAIR images.
Deep white matter hyperintensities occur deep within white matter, periventricular white matter hyperintensities occur adjacent to the lateral ventricles and subcortical hyperintensities occur in the basal ganglia. [citation needed] Hyperintensities are often seen in auto immune diseases that have effects on the brain. [6]
FLAIR hyperintensity confined to sulcus and/or cortex/subcortical white matter in one location < 5 cm FLAIR hyperintensity 5 to 10 cm, or more than 1 site of involvement, each measuring < 10 cm FLAIR hyperintensity measuring > 10 cm, often with significant subcortical white matter and/or sulcal involvement.
“White matter hyperintensities specifically refer to lesions found in the white matter tracts of the brain, i.e., the cables connecting neurons, and are an imaging biomarker for diseases ...
Posterior reversible encephalopathy syndrome; Other names: Reversible posterior leukoencephalopathy syndrome (RPLS) Posterior reversible encephalopathy syndrome visible on magnetic resonance imaging as multiple cortico-subcortical areas of T2-weighted hyperintense (white) signal involving the occipital and parietal lobes bilaterally and pons.
Symptoms include sudden increase in blood pressure, acute confusional state, headaches, vomiting, and seizure. Retinal hemorrhages and hard exudates may be present on funduscopic exam. Hypertensive leukoencephalopathy may have concurrent cardiac ischemia and hematuria.
Aicardi–Goutières syndrome, a hereditary disease caused by mutations in the TREX1, RNASEH2B, RNASEH2C, RNASEH2A, ADAR1, SAMHD1, IFIH1, LSM11, or RNU7-1 gene. HIV encephalopathy (encephalopathy associated with HIV infection and AIDS, characterized by atrophy and ill-defined white matter hyperintensity).
White matter is the tissue through which messages pass between different areas of grey matter within the central nervous system. The white matter is white because of the fatty substance (myelin) that surrounds the nerve fibers (axons). This myelin is found in almost all long nerve fibers, and acts as an electrical insulation.
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