Superdominant left-circumflex artery supplying significant proportion of RCA and LAD territory.

To cite: Agrawal N. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2015210365 DESCRIPTION Coronary artery dominance refers to whether the posterior descending artery (PDA) and posterolateral vessel (PLV) originate from the right coronary artery (RCA; 80%), left circumflex artery (LCX; left dominant 8–10%), or both (codominant). A vessel is considered super-dominant when it is extremely large and supplies the territory that is normally supplied by the other vessel. We present an interesting case of a 56-year-old hypertensive woman with no other significant medical or surgical history. The patient presented with unstable angina and was taken up for diagnostic angiogram, which incidentally revealed the presence of a super-dominant LCX artery; the artery supplied the PDA and PLV branches rendering the