• Progressive cognitive decline is characterized by impaired executive function,
working memory, intelligence, declarative learning and memory, information
functions; MLD:psychosis, behavioral disturbances, and dementia; GLD: hemiparesis, intellectual impairment, cerebellar ataxia, and visual failure;
Ann N Y Acad Sci. Oct 2008; 1142: 266–3096.
The disorder usually presents with executive system dysfunction and other neurobehavioral
deficits, progressing to dementia.
7
MRI in patients with MELAS
• Periventricular and diffuse WM hyperintensities, as well as areas of cortical infarction and cerebral edema, are seen on MRI
8
脆性X相关震颤和(或)共济失调综合征
• White matter pallor is seen in the cerebellar parenchyma (A), as well as in the middle cerebellar peduncles (B).