edited later to add: oops, I misread your msg. You had a CT not an MRI.

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I wouldn't go worrying too much about the white spot if your neuro said it was fine. MRIs often show what are called 'artifacts' and they're usually white spots and can be caused by dozens of things not related to your anatomy necessarily.

Check out the link for the sections
Hyperintensity/hypointensity and Artifact

http://neurology.about.com/od/Radiol...ri-Results.htm