Is there any cases where teenagers get coronary atherosclerosis visible on ct scans already?

Kawasaki Disease: This is an inflammation of the arterial wall that happens rarely in young children, sometimes leading to calcification of the arteries later in life. There are also genetic abnormalities both of the arterial wall make-up as well as metabolic problems that lead to early vascular calcification.

Coronary in teens: Not unless they have genetic disorder.

Yes, but Unusual: Ivus commonly detects and micro-calcification can be found in early teenager years; atherosclerosis has been known, for over 7 decades, from autopsy data, to typically begin in later childhood. However, the best current ct scanners are typically incapable of detecting calcification within the base of atherosclerotic plaques until most people are early to mid 30s. The e-speed ebt machines work best.