Kayser–Fleischer ring
{{Distinguish|Fleischer ring}}
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| name = Kayser–Fleischer ring
| image = Kayser-Fleischer ring.jpg
| caption = A Kayser–Fleischer ring in a 32-year-old patient who had longstanding speech difficulties and tremor.
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Kayser–Fleischer rings (KF rings) are dark rings that appear to encircle the cornea of the eye. They are due to copper deposition in the Descemet's membrane as a result of particular liver diseases. They are named after German ophthalmologists Bernhard Kayser and Bruno Fleischer who first described them in 1902 and 1903.{{cite journal | author=Kayser B | title=Über einen Fall von angeborener grünlicher Verfärbung des Cornea | journal=Klin Monatsbl Augenheilk | year=1902 | volume=40 | issue=2 | pages=22–25}}{{cite journal | author=Fleischer B | title=Zwei weitere Fälle von grünlicher Verfärbung der Kornea | journal=Klin Monatsbl Augenheilk | year=1903 | volume=41 | issue=1 | pages=489–491}}{{WhoNamedIt|synd|1758}} Initially thought to be due to the accumulation of silver, they were first demonstrated to contain copper in 1934.{{cite journal | vauthors=Gerlach W, Rohrschneider W | title=Besteht das Pigment des Kayser-Fleischerschen Hornhautringes aus Silber? | journal=Klin Wochenschr | year=1934 | volume=13 | issue=2 | pages=48–49 | doi=10.1007/BF01799043}}
Presentation
File:KF ring and Sunflower cataract.jpg
The rings, which consist of copper deposits where the cornea meets the sclera, in Descemet's membrane, first appear as a crescent at the top of the cornea. Eventually, a second crescent forms below, at the "six o'clock position", and ultimately completely encircles the cornea.{{Cite GPnotebook|-1684406263|Kayser–Fleischer rings}}
=Associations=
Kayser–Fleischer rings are a sign of Wilson's disease, which involves abnormal copper handling by the liver resulting in copper accumulation in the body and is characterised by abnormalities of the basal ganglia of the brain, liver cirrhosis, splenomegaly, involuntary movements, muscle rigidity, psychiatric disturbances, dystonia and dysphagia. The combination of neurological symptoms, a low blood ceruloplasmin level and KF rings is diagnostic of Wilson's disease.
Other causes of KF rings are cholestasis (obstruction of the bile ducts), primary biliary cirrhosis and "cryptogenic" cirrhosis (cirrhosis in which no cause can be identified).
Diagnosis
As Kayser–Fleischer rings do not cause any symptoms, it is common for them to be identified during investigations for other medical conditions. In certain situations, they are actively sought; in that case, the early stages may be detected by slit lamp examination before they become visible to the naked eye.{{cite journal |vauthors=McDonnell G, Esmonde T |title=A homesick student |journal=Postgrad Med J |volume=75 |issue=884 |pages=375–8 |year=1999 |pmid=10435182 | url= |pmc=1741256 |doi=10.1136/pgmj.75.884.375}}
See also
References
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External links
{{Medical resources
| DiseasesDB = 30056
| ICD10 = {{ICD10|H|18|0|h|15}}
| ICD9 = {{ICD9|371.14}}
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{{Eye pathology}}
{{Eponymous medical signs for eyes and ears}}
{{DEFAULTSORT:Kayser-Fleischer ring}}