My Husband Is An Active 68 Year Old Man With

My husband is an active 68 year old man with controlled blood pressure, cholesterol and type 2 diabetes. He walks about 10000 steps a day and seems healthy in every way. He has no symptoms of heart issues. His dad though had a quintuple bypass and heart attacks. By fluke at a reg checkup his PCP said he has a little "rattle" in his lungs and dr wanted to make sure it wasn't the beginnings of pneumonia so he did a chest X-ray. The X-ray came back with no pneumonia but the radiologist noticed calcium in the arteries and mentioned his stent. My husband does not have a stent. So our PCP ordered a coronary calcium CT scan. Immediately upon getting the results he called him in. When we went in he found out his Agatston score was 3,882. The radiologist noted it is the in the "severe" range. We were sent to the cardiologist who ordered a nuclear stress test that was completed today but we have no results. That doctor said, before the test, the calcium could be inside the arteries or the outside. He indicated he would not change anything my husband is doing or taking but if on the inside it would need further treatment. We both understand the inside issues. We can't find out anything more about the outside calcium. We didn't think about the questions until we left the office. 1. What are ramifications of having that much calcium on the outside of the arteries, if that is what it is? 2. How did it get there if not through the blood vessels? 3. Would this still be considered CAD? 4. What is the long term prognosis with it on the outside? 5. Will the number keep increasing? 6. Is there a URL that explains, in layman terms, this condition of outside artery calcium? Thank you for any insight you can give. We are the type of people that want and need as much info as possible.