Dot, Flame, Boat Retinal Hemorrhages
This slide of a patient with acute lymphocytic leukemia shows three types of retinal hemorrhages.
The , lying deep within the retina, reflect leakage of capillaries or venules. They are common in diabetes.
The , lying within the superficial nerve fiber layer, reflect ischemic leakage from arterioles or veins that are ischemic or, in the case of veins, under high pressure.
The (pre-retinal), lying at the interface between retina and vitreous, reflects leakage under enough pressure to burst through the internal liminiting membrane of the retina.
Blood can also escape into the vitreous cavity to cause a vitreous hemorrhage.
To learn more about retinal hemorrhages and their causes, check out Retinal Hemorrhages.