@coldbear Since you said we are similar in terms of head rotation, mine was found in the CT Angio but I really do not feel many symptoms when I rotate my head. I feel mild neck pain or subtle increase in the tinnitus. Since you are good with reading images. I linked the post below where I posted the three images from CT Angio that shows the collateral flow when I turn my head left and when neutral but no collateral is evident when I turn my head to the right which was interpreted as Styloid compression easing on the left jugular vien. You might be interested in them.