Blood clotting usually is absorbed shortly after three days post injury. There are some arterial and venous issues that can be found with MRA. I have some 'outpouching' that is considered of minimal consequence.

I wonder if it is the cause of my head aches. Does it swell during higher blood pressure events? My neuro is retired so I can't ask him. I just read the report from the MRA a few years ago and even saw the images. Very interesting tangled web of vasculature.

But, my head aches are usually between the temples. The outpouching is more posterior than that.

fyi, The image is produced by process of elimination. The first MRI is done with normal imaging parameters that image all of the brain structure. The second MRI is done with parameters that do not image the vascular structure. They subtract the second image from the first image and what is left is just the vascular structure. The image looks like the blood vessels are hanging in space.