Kearns Sayre Syndrome
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Kearns Sayre Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
- chronic progressive external ophthalmoplegia and myopathy
- chronic progressive external ophthalmoplegia with ragged red fibers
- CPEO with myopathy
- CPEO with ragged red fibers
- mitochondrial cytopathy
- occulocraniosomatic syndrome (obsolete)
- ophthalmoplegia, pigmentary degeneration of the retina and cadiomyopathy
- ophthalmoplegia plus syndrome
Kearns-Sayre syndrome (KSS) is a rare neuromuscular disorder characterized by three primary findings: progressive paralysis of certain eye muscles (chronic progressive external ophthalmoplegia [CPEO]); abnormal accumulation of colored (pigmented) material on the nerve-rich membrane lining the eyes (atypical retinitis pigmentosa), leading to chronic inflammation, progressive degeneration, and wearing away of certain eye structures (pigmentary degeneration of the retina); and heart disease (cardiomyopathy) such as heart block. Other findings may include muscle weakness, short stature, hearing loss, and/or the loss of ability to coordinate voluntary movements (ataxia) due to problems affecting part of the brain (cerebellum). In some cases, KSS may be associated with other disorders and/or conditions.
KSS belongs (in part) to a group of rare neuromuscular disorders known as mitochondrial encephalomyopathies. Mitochondrial encephalomyopathies are disorders in which a defect in genetic material arises from a part of the cell structure that releases energy (mitochondria), causing the brain and muscles to function improperly (encephalomyopathies). In these disorders, abnormally high numbers of defective mitochondria are present. In approximately 80 percent of cases of KSS, tests will reveal missing genetic material (deletion) involving the unique DNA in mitochondria (mtDNA).
March of Dimes Birth Defects Foundation
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It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report
This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.
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Last Updated: 12/26/1969
Copyright 2013 National Organization for Rare Disorders, Inc.
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