What does extensive calcification costal cartilidge ribs mean on x-ray?

From Cost To Cost: Usually nothing.It's very common in older people.I'll let you define "older;" in my case I define it as older than 150. but there are very rare cases of an underlying problem (like of the thyroid or other metabolic problem). No need to freak out because those things are not an immediate threat to life but you might consider talking to your doctor,especially if you have any symptoms that bother you