Hi Zenda,
I had my left carotid artery removed last month due to cancer involvement, reirridation. Before the removal, I had an Angiogram on both arteries, CT scan and probably ultrasound Doppler, the works, and a temporary balloon occlusion test to see if I could survive with one artery blocked, in my case to be resected, and passed the test. I don't know if any blockage was found during these tests, and plan on getting written copies of the them. I have the CD, and can't make heads or tails of it. The biopsy of the left carotid shows calcification. Prior PET/CT scans a year ago, showed slight arteriosloris in the arteries to the heart. I guess other things can contribute like smoking, high blood pressure, diabetes, diet, and as finding out, radiation.
I plan on seeing a cardiovascular doctor too, and hope to be monitored, with only one carotid arterty left. Maybe I'll go to the hospital that did my testing that has a world renowned neuroscience program. I also read chiropractor manipulation can cause problems with stenosis, like stroke, and believe massage or any other manipulation also. No one other than my ENT, medical team, is touching my neck lol.
Good luck with everything.