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Uptodate Reference Title
Preretinal hemorrhages
Preretinal hemorrhages
A preretinal (subhyaloid) hemorrhage develops when blood escapes into the potential space between retina and vitreous. A preretinal hemorrhage typically is larger than other retinal hemorrhages. Because it is anterior to the retina, a preretinal hemorrhage obscures underlying retinal vessels. In an erect patient, red cells settle, creating a horizontal line of demarcation between plasma above and cells below.