Iris cyst
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2008-05-28T17:33:00Z
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[[Image:Iris cyst.JPG|thumb|Iris cysts]]
An '''iris cyst''', or '''uveal cyst''', is a small hollow structure either attached to the [[iris (anatomy)|iris]] of the [[eye]] or floating free in the [[anterior chamber]]. An iris cyst is composed of a single cell layer of [[epithelium]] and is filled with fluid.<ref>{{cite journal |author=Grahn B, Wolfer J |title=Diagnostic ophthalmology. Distichiasis and uveal cysts |journal=Can Vet J |volume=38 |issue=6 |pages=391–2 |year=1997 |pmid=9187812}}</ref> It is most commonly seen as secondary to inflammation in the eye, especially with [[glaucoma]]. They are most commonly seen in [[dog]]s. [[Golden Retriever]]s, [[Labrador Retriever]]s, and [[Boston Terrier]]s are the most commonly affected breeds.<ref>{{cite web | last = Ketring | first = Kerry I. | title = The top ten ophthalmic mistakes | work = Proceedings of the North American Veterinary Conference | date = 2006 | url = http://www.ivis.org/proceedings/navc/2006/SAE/308.pdf?LA=1 | format = PDF | accessdate = 2007-03-23 }}</ref> Iris cysts also occur in [[cat]]s and [[horse]]s. The cysts are usually free floating in dogs, attached to the pupillary margin in cats, and present in the interior of the iris (especially blue irides) in horses.<ref>{{cite web | title = Anterior Uvea | work = The Merck Veterinary Manual | date = 2006 | url = http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/30110.htm | accessdate = 2007-03-23 }}</ref>
Iris cysts usually cause no symptoms, but in large numbers they can cause glaucoma by obstructing the [[trabecular meshwork|drainage angle]] of the eye. Golden Retrievers may have a higher rate of glaucoma associated with iris cysts.<ref>{{cite journal |author=Sapienza J, Simó F, Prades-Sapienza A |title=Golden Retriever uveitis: 75 cases (1994-1999) |journal=Vet Ophthalmol |volume=3 |issue=4 |pages=241–246 |year=2000 |pmid=11397310 |doi=10.1046/j.1463-5224.2000.00151.x}}</ref>
Iris cysts need to be differentiated from iris [[melanoma]], a tumor, by demonstrating their hollowness. A light directed at an iris cyst will cause it to [[transillumination|transilluminate]]. Iris cysts can be collapsed if necessary by a [[veterinarian]] with a small needle carefully introduced into the anterior chamber.<ref name=Gelatt_1999>{{cite book|author=Gelatt, Kirk N. (ed.)|title=Veterinary Ophthalmology|edition=3rd ed.|publisher=Lippincott, Williams & Wilkins|year=1999|id=ISBN 0-683-30076-8}}</ref> The cysts may also be destroyed by use of a [[Laser diode|semiconductor diode laser]].<ref>{{cite journal |author=Gemensky-Metzler A, Wilkie D, Cook C |title=The use of semiconductor diode laser for deflation and coagulation of anterior uveal cysts in dogs, cats and horses: a report of 20 cases |journal=Vet Ophthalmol |volume=7 |issue=5 |pages=360–8 |year=2004 |pmid=15310297 |doi=10.1111/j.1463-5224.2004.04004.x}}</ref>
==References==
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[[Category:Dog diseases]]
[[Category:Ophthalmology]]
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