PMC2935134_01
Macroscopy of the brain; the occluded thrombotic basilar artery is seen.
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fig1
The occlusion of the basilar artery involved mainly the median portion. Note the atheromatous basilar artery, with an extensive and fresh thrombus.
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fig2
The dissected basilar artery, from the origin of the vertebral arteries to its top, is shown (Figure 2); samples of brain stem tissues were microscopically examined.
Severed endothelium in the territory of a pontine artery (center of the figure) with fragments of a fresh thrombus (right in the figure).
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fig3
Pontine arteries showed extensive alterations, mainly in the form of severed endothelium, which suggested a thrombotic-traumatic mechanism as the main etiological factor (Figure 3). 
Intraluminal thrombus.
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fig4
A thrombosed arteriole in the sagittal section. The fresh thrombus expanded longitudinally. There is evidence of adjacent cellular edema.
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fig5