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- W1990854708 abstract "Autopsy studies in 8 girls with the Rett syndrome dying between 4 and 15 years showed: (1) Diffuse cerebral atrophy/micrencephaly, with a decrease in brain weight by 13.8 to 33.8 % of age-matched controls, apparently related to the duration of the disorder; (2) Mild, but inconsistent diffuse cortical atrophy without developmental disorders apart from occasional microdysgenesis (three cases), but increased amounts of neuronal lipofuscin, and occasional mild astrocytic gliosis; (3) Mild, but inconsistent spongy changes in cerebral and cerebellar white matter, optic nerve (two cases), and myelinated fascicles of the brainstem tegmentum, without signs of dys- or demyelination, and apparently different from the spongy myelinopathy common to aminoacidopathies; (4) Mest conspicuous was an underpigmentation of the substantia nigra which contained many fewer well-pigmented neurons for age (53–73 %), and fewer pigmented granules per neuron, while the total number of nigral neurons and the triphasic substructure of neuromelanin were normal far age. No pathologic changes were seen in locus coeruleus, nucleus basalis of Meynert, and nucleus dorsalis raphe; (5) Electron microscopy of autopsy material from an 11-year-old girl showed increased amounts of neuronal lipefuscin without signs of a storage disorder. Reactive and degenerating axons in the caudate nucleus were pessibly related to the nigral changes, suggesting some dysfunction of the dopaminergic nigro-striatal system, while the synaptic organization of the neostriatum appeared unaffected. (6) Peripheral nerve from a patient dying in advanced stage showed increased numbers of unmyelinated (regenerated?) axons, with almost no demyelination and few remyelinated axons, suggesting axonal degeneration rather than hypomyelination, but exogenous factors (malnutrition) cannot be excluded. The pathogenetic mechanisms of the morphologic brain lesions and their relations to clinical and neurochemical findings in Rett syndrome are unknown and deserve further intensive investigations." @default.
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- W1990854708 date "1986-01-01" @default.
- W1990854708 modified "2023-10-16" @default.
- W1990854708 title "Neuropathology of rett syndrome" @default.
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- W1990854708 doi "https://doi.org/10.1002/ajmg.1320250528" @default.
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