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Central retinal vein occlusion
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Blockage of the central retinal vein in the eye
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Wikipedia

Central retinal vein occlusion, also CRVO, is when the central retinal vein becomes occluded, usually through thrombosis. The central retinal vein is the venous equivalent of the central retinal artery and both may become occluded. Since the central retinal artery and vein are the sole source of blood supply and drainage for the retina, such...

Instance of
class of disease
References
Wikidata