Dementia of frontal type and dementias with subcortical gliosis.

Brain Pathology
D M Mann

Abstract

The group of Frontotemporal dementias (FTD) is composed of non-Alzheimer forms of dementia characterized clinically by behavioural and personality change leading to apathy and mutism. The disorder is associated with a progressive atrophy of the frontal, anterior temporal and anterior parietal lobes of the brain with several types of underlying pathology. One type (frontal lobe degeneration) is characterized by a microvacuolar degeneration of the outer cortical laminae along with a mild and mainly subpial gliosis and a loss of nerve cells, mostly from layers II and III. Another type shows transcortical tissue cavitation and florid gliosis with neuronal degeneration characterized by the presence of tau and ubiquitin positive inclusion bodies and alpha beta-crystallin-positive ballooned neurones: such changes have been termed 'Pick-type histology', and form the basis for the modern definition of 'Pick's disease'. The aetiological relationship between these two histological types is presently unknown. Both histologies can be differently distributed topographically throughout the brain to produce syndromes of progressive language disorder, when affecting bitemporal lobes or the left hemisphere preferentially, or progressive apraxia ...Continue Reading

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Citations

Aug 25, 2001·Annual Review of Neuroscience·V M LeeJ Q Trojanowski
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