Results: Study of 48 patients by cardiac MSCT with Ultravist IV since October 2006 in MEDIC HCMC shows MSCT is the safe method for detecting coronary arterial fistula, determining the site, assessing the size of connection as well as imaging anatomical relation and the whole way of coronary vessel in 3 D view prior to interventional cardiac catheterization or surgery. Fistula from RCA into RV or RA are the most frequent malformation, then connection between RCA and PA The coronary artery is dilated and elongated.