http://www.usc.edu/hsc/pharmacy/ced/dietchol/DietChl2.htm
A technical discussion about the relationship between free radicals and atherosclero

http://neurosurgery.mgh.harvard.edu/vaschome.htm#AVMs
This site has a lot of text explaining about strokes, aneurysms, and other phenomena related to cerebral circulation. There are many links to other medical centers that contain diagrams and images of angiograms.