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The MRI of patients with VWM shows a well defined leukodystrophy. These MRIs display reversal of signal intensity of the white matter in the brain. Recovery sequences and holes in the white matter are also visible. [4] Over time, the MRI is excellent at showing rarefaction and cystic degeneration of the white matter as it is replaced by fluid.
The degeneration of white matter, which reflects the degeneration of myelin, can be seen in a basic MRI and used to diagnose leukodystrophies of all types. T-1 and T-2 weighted fluid-attenuated inversion recovery (FLAIR) images are the most often used approach. [25] Electrophysiological and other kinds of laboratory testing can also be done.
A series of cases with megalencephalic leukodystrophy were described by the Indian neurologist Bhim Sen Singhal (1933-)in 1991. [14] [11] [15] However, it is sometimes referred to as Van der Knaap disease after the Dutch neurologist Marjo van der Knaap who described another series of cases with clinical and radiological features in 1995. [16 ...
An average clinical profile from published studies shows that the median onset age for HDLS patients is 44.3 years with a mean disease duration of 5.8 years and mean age of death at 53.2 years. [2] [11] As of 2012, there have been around 15 cases identified with at least 11 sporadic cases of HDLS.
The disease belongs to a family of disorders called the leukodystrophies. The most common clinical manifestations are migraine headaches and transient ischemic attacks or strokes, which usually occur between 40 and 50 years of age, although MRI is able to detect signs of the disease years prior to clinical manifestation of disease. [2] [3]
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Leukoencephalopathy (leukodystrophy-like diseases) is a term that describes all of the brain white matter diseases, whether their molecular cause is known or unknown. [1] It can refer specifically to any of these diseases: Progressive multifocal leukoencephalopathy; Toxic leukoencephalopathy
Pelizaeus–Merzbacher disease is the common name for hypomyelinating leukodystrophies (HLD). [6] There are at least 26 HLD variants cataloged by the National Institutes of Health National Library of Medicine [ 7 ] and the Online Mendelian Inheritance in Man (OMIM) compendium of human genes and genetic phenotypes.