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Related Concept Videos

Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...
Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...
Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
Dementia01:30

Dementia

Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual.

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Related Experiment Video

Updated: Jun 23, 2026

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
12:28

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains

Published on: June 3, 2020

Rapidly progressive young-onset dementia.

Brendan J Kelley1, Bradley F Boeve, Keith A Josephs

  • 1Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.

Cognitive and Behavioral Neurology : Official Journal of the Society for Behavioral and Cognitive Neurology
|April 18, 2009
PubMed
Summary
This summary is machine-generated.

Rapidly progressive young-onset dementia (RP-YOD) presents with diverse causes and overlapping symptoms, often mimicking Creutzfeldt-Jakob disease. Diagnostic evaluations are crucial for identifying the etiology in these challenging cases.

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Area of Science:

  • Neurology
  • Neuroscience
  • Dementia Research

Background:

  • Limited data exists on rapidly progressive young-onset dementia (RP-YOD).
  • Existing literature primarily comprises case reports or small series.
  • Characterizing RP-YOD is essential for understanding its clinical spectrum.

Purpose of the Study:

  • To characterize a cohort of patients with dementia onset before age 45.
  • To identify common clinical features and potential etiologies of RP-YOD.
  • To evaluate the diagnostic utility of various investigations in RP-YOD.

Main Methods:

  • Retrospective review of Mayo Clinic medical records.
  • Inclusion criteria: dementia onset before age 45 with rapid progression.
  • Comprehensive review of clinical data, laboratory results, neuroimaging, and pathology.

Main Results:

  • Twenty-two patients met the study criteria.
  • Common early features included behavioral/affective disorders, cerebellar, and visual/oculomotor dysfunction.
  • Many patients exhibited features suggestive of Creutzfeldt-Jakob disease.
  • Diagnostic testing identified the etiology in most cases.

Conclusions:

  • RP-YOD encompasses various etiologies with overlapping clinical presentations.
  • Creutzfeldt-Jakob disease-like features are prevalent in RP-YOD.
  • While diagnostic studies are helpful, some cases remain challenging to diagnose definitively.