--you mention having excessive calcium in your arteries; do you also have (if you know) excessive serum calcium?

As a mineral, calcium is kept in very tight check by the body, specifically by hormones secreted by the parathyroid glands imbeded in the thryoid. (They are like four little peas inthe flesh of the thyroid.)

It is not uncommon for calcium imbalances to result from problems of these glands. My mother had a tumor--benign--of one of them that was discovered when her calcium serum levels--and evidence of arterial deposits--became abnormally high. She underwent surgery and is fine, though she must now take more supplemental calcium than before.

Another thing--high serum calcium levels often result when calcium is being leached or broken down from bone. There are a number of reasons for this, but often it results from tumors of the bone or blood cell producing tissues, and if calcium levels come back high, more sophisticated testing, including calcium ion levels, peripheral blood smear/cell typing, and a bone scan may be indicated.

does not lead to kidney stones of the calcium oxalate type.

It is the oxalate that is the culprit. For people with kidney stone histories,
the type of calcium recommended is calcium CITRATE.

A bacteria called Oxalobacter fomigenes normally removes oxalate
in the GI tract so it does not build up in the body: antibiotics can kill this off, leading to oxalate absorption
http://aem.asm.org/cgi/content/abstract/68/8/3841

It is thought that excess calcium may be deposited in tissues when magnesium is low, so the other posters here are correct, that a quality magnesium
product may help. But in order to remove calcium already there, you may
have to consider chelation. If you Google chelation there are tons of articles.
I'd hold off on a stent for now, given the bad press just out on those. There are new ones coming out that dissolve...those may have a better prognosis.
http://www.msnbc.msn.com/id/15405830/
It is unclear what they "do" so that they can dissolve away, at least to me.