If you had mri to check for coronary anomaly and results were left one normal and fairly sure 90% right one is and advised no more test. what wouyoudo?

Depends: Depends on what, if any, symptoms you have. A coronary anomaly is 1 in a 1, 000. A serious coronary anamaly is 1 in 10, 000. A 10% uncertainty make it about a 1 in 100, 000 chance that you have a serious coronary anomoly. If there's still uncertainty, do a nuclear stress test. If there's no ischemia (ie, a normal test) that would further reduce the likelhood to literally 1 in a million!