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Related Concept Videos

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...
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...
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.
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...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
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...

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Related Experiment Video

Updated: Jul 17, 2026

Using Retinal Imaging to Study Dementia
09:17

Using Retinal Imaging to Study Dementia

Published on: November 6, 2017

[Potentially reversible dementia].

François Sellal1, Henri Becker

  • 1Département de Neurologie, Hôpitaux Universitaires de Strasbourg et Inserm U-692, 67091 Starsbourg, France. Francois.Sellal@chru-strasbourg.fr

Presse Medicale (Paris, France : 1983)
|January 30, 2007
PubMed
Summary

Potentially reversible dementia is rare, mimicking Alzheimer's disease. Precise clinical and imaging analysis aids diagnosis, though full recovery isn't guaranteed, and other conditions can worsen dementia.

Area of Science:

  • Neurology
  • Geriatrics

Context:

  • Reversible dementia constitutes a small fraction (approx. 1.5%) of all dementia cases.
  • While often rare, reversible dementia can present symptomatically similar to Alzheimer-type dementia.
  • Systematic investigations for infectious, endocrine, or vitamin deficiencies are infrequently causative but remain important.

Purpose:

  • To emphasize the importance of detailed clinical assessment and cerebral imaging in diagnosing reversible dementia.
  • To highlight that 'potentially reversible dementia' is a more accurate term, acknowledging that complete recovery is not assured.
  • To underscore the role of identifying and treating co-existing reversible conditions that may exacerbate dementia.

Summary:

  • Reversible dementia is uncommon and can mimic Alzheimer's disease, necessitating thorough clinical evaluation and neuroimaging.

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Last Updated: Jul 17, 2026

Using Retinal Imaging to Study Dementia
09:17

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Published on: November 6, 2017

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12:28

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

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The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease
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The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease

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  • Diagnostic efforts should focus on a detailed patient history, cognitive and behavioral symptoms, and imaging findings.
  • Even when a reversible cause is found, complete patient recovery is not guaranteed, and co-existing conditions can worsen the dementia progression.

    • Impact:

    • Improved diagnostic accuracy for a rare subset of dementia patients.
    • Refined clinical terminology to better reflect prognosis and treatment outcomes.
    • Enhanced management strategies by addressing contributing reversible factors in dementia care.