Hollenhorst plaques

Hollenhorst plaque Cholesterol emboli Acute intrinsic renal failure—vascular... 

Hollenhorst plaque—Cholesterol emboh that usually dislodges from the carotid arteries, or calcific fragments from a stenosed aortic valve that can be visualized on a retinal exam. 

Recurrent transient neurological deficits also occur commonly in patients with ICA stenosis. These deficits generally last for less than 3 min and include transient monocular blindness as well as transient hemispheric neurologic deficits. Their pathologic basis is unknown, though in some cases of transient monocular blindness there is evidence of low flow (the box car appearance of red cell clumps separated by clear space) in the retinal arterioles. The retina may also contain highly refractile cholesterol emboli called Hollenhorst plaques. In many instances of severe carotid stenosis or occlusion, the intracranial collateral flow is sufficient to perfuse the brain and prevent ischemia [17]. 

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