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Hyperintensities are commonly divided into 3 types depending on the region of the brain where they are found. 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]
White matter hyperintensities can be caused by a variety of factors, including ischemia, micro-hemorrhages, gliosis, damage to small blood vessel walls, breaches of the barrier between the cerebrospinal fluid and the brain, or loss and deformation of the myelin sheath.
The substantia nigra is a third colored component found in the brain that appears darker due to higher levels of melanin in dopaminergic neurons than its nearby areas. White matter can sometimes appear darker than grey matter on a microscope slide because of the type of stain used.
When examining blood oxygen levels, scientists found that lower oxygen levels during sleep was correlated with both higher hippocampal volume and white matter hyperintensities, or areas of brain ...
The diagnosis is typically made with magnetic resonance imaging of the brain. The findings most characteristic for PRES are symmetrical hyperintensities on T 2-weighed imaging in the parietal and occipital lobes; this pattern is present in more than half of all cases. [1] [3] FLAIR sequences can be better at showing these abnormalities. [4]
The characteristics of the brain upon autopsy are often very similar to atypical diffuse sclerosis, such as the presence of fibrillary astrocytes and scant sudanophilic lipids. [2] Adult-onset VWM disease can present with psychosis and may be hard to differentiate from schizophrenia. [11]
This wave of activity, called a cortical spreading depression, follows a particular pattern across the brain and can create a few different patterns of light in your vision. For example, the Mayo ...
The brain fluid flow fluctuates in correspondence to blood volume changes, suggesting the vessels act as pumps to propel the surrounding brain fluid to flush out waste.