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Most of the brain in MS is unaffected. Though obviously normal white matter appears normal under MRI, so does the NAWM white matter described in the next section. To establish a difference, normal white matter is named Non-lesional white matter (NLWM) [134] This normal white matter is reported to be around 56% of the total WM of the patients. [135]
Periventricular leukomalacia (PVL) is a form of white-matter brain injury, characterized by the necrosis (more often coagulation) of white matter near the lateral ventricles. [ 1 ] [ 2 ] It can affect newborns and (less commonly) fetuses; premature infants are at the greatest risk of neonatal encephalopathy which may lead to this condition.
Using high field MRI system, with several variants several areas show lesions, and can be spacially classified in infratentorial, callosal, juxtacortical, periventricular, and other white matter areas. [21] Other authors simplify this in three regions: intracortical, mixed gray-white matter, and juxtacortical. [22]
Most MS findings take place inside the white matter, and lesions appear mainly in a periventricular distribution (clustered around the ventricles of the brain). Apart from white matter demyelination, the cortex and deep gray matter (GM) nuclei can be affected, together with diffuse injury of the NAWM. [13]
Currently, routine clinical follow-up and MRI neuroimaging surveillance is the standard by which patients are observed. [4] While treatment of MS disease modifying therapies have been given to some individuals with RIS, the majority opt for active surveillance and the appearance of clinical symptoms before commencing treatment, [5] as treatment is considered controversial.
Research in multiple sclerosis may find new pathways to interact with the disease, improve function, curtail attacks, or limit the progression of the underlying disease. . Many treatments already in clinical trials involve drugs that are used in other diseases or medications that have not been designed specifically for multiple sclero
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.
Inflammatory demyelinating diseases (IDDs), sometimes called Idiopathic (IIDDs) due to the unknown etiology of some of them, are a heterogenous group of demyelinating diseases - conditions that cause damage to myelin, the protective sheath of nerve fibers - that occur against the background of an acute or chronic inflammatory process.
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