SUE FORD / SCIENCE PHOTO LIBRARY SUE FORD / SCIENCE PHOTO LIBRARY
Retinal aneurysm. Ophthalmoscope view of the retina in the eye of a patient with a large aneurysm. The retina is orange with red branching blood vessels. The aneurysm is the balloon like swelling of a blood vessel seen at upper right. An aneurysm is an abnormal ballooning of an artery caused by the pressure of blood flowing through a weakened blood vessel. The aneurysm may be caused by disease, injury or a congenital defect in the artery wall. Aneurysm can cause damage to surrounding tissue by swelling or bursting. In this case the light sensitive cells of the retina may be permanently damaged leading to loss of sight.
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