Neuro-Ophthalmology & Neuro-Otology
Systemic small-vessel vasculitis
Dec. 28, 2016
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The major attributes that determine the degree of ischemic risk inherent to any cerebrovascular lesion are depicted in this artistic rendition. Hemodynamic Impact: As the lumen of the vessel decreases, the flow becomes progressively disturbed (from laminar to turbulent), reduced and, on occlusion, will cease and stagnate. Emboligenicity: Lesions with smooth surface and endothelial integrity have little emboligenic potential. As the surface becomes irregular or the endothelium becomes disrupted, subendothelial thrombogenic tissue is exposed to the lumen. In atherosclerotic plaques, neovascularization can lead to intraplaque hemorrhage, which is capable of acute rupture and sudden lumen reduction. Branch Involvement: Pathology of the parent vessel may either extend into different branches, or embed smaller collaterals, creating more than one compartment of ischemia. (Contributed by Dr. Camilo Gomez.)