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Diseases

Genetic and Rare Diseases Information Center (GARD)

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Agnosia


Other Names for this Disease

  • Monomodal visual amnesia
  • Primary visual agnosia
  • Visual amnesia
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Cause

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What causes agnosia?

Primary visual agnosia occurs as a result of damage to the brain. Symptoms develop due to the inability to retrieve information from those damaged areas that are associated with visual memory. Lesions may occur as a result of traumatic brain injury, stroke, tumor, or overexposure to dangerous environmental toxins (e.g., carbon monoxide poisoning). In some cases, the cause of the brain damage may not be known. Symptoms may vary, according to the area of the brain that is affected.

Visual agnosia may also occur in association with other underlying disorders (secondary visual agnosia) such as Alzheimer's disease, agenesis of the corpus callosum, MELAS, and other diseases that result in progressive dementia. Disorders that may precede the development of primary visual agnosia (and may be useful in identifying an underlying cause of some forms of this disorder) include Alzheimer's disease, Pick's disease, and a rare disorder called Balint's syndrome.[1]
Last updated: 4/22/2011

References
  1. Agnosia, Primary Visual. NORD. 2009; http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Agnosia%2C%20Primary%20Visual. Accessed 4/22/2011.


Other Names for this Disease
  • Monomodal visual amnesia
  • Primary visual agnosia
  • Visual amnesia
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.