The left main coronary artery (LMCA) or left coronary artery (LCA) is one of the two main arteries that supply the heart with oxygenated blood.
It is a branch of the ascending aorta, with its normal origin in the left aortic sinus, just superior to the aortic valve 1-2.
The ramus intermedius is a variant coronary artery resulting from trifurcation of the left main coronary artery 1. It is present in ~20% (range 15-30%) 2-3 of the population.
It can have a course similar to the obtuse marginal branches of the left circumflex artery or the diagonal branches of t...
Coronary MR angiography (coronary MRA) is a developing approach to imaging the coronary arteries.
Advantages of coronary MRA include avoidance of the intravenous iodinated contrast and ionizing radiation used in coronary CT angiography and conventional angiography.
A disadvantage of coronary M...
The coronary veins return blood from the myocardium back to the right atrium. Coronary venous anatomy is highly variable, but is generally comprised of:
cardiac veins (drain into the coronary sinus)
great cardiac vein (adjacent to the left anterior descending artery)
The coronary sinus is the major coronary vein. It returns the majority of the left ventricular blood flow to the right atrium.
The coronary sinus courses along the posterior wall of the left atrium into the left atrioventricular groove. It normally drains into the right atrium. T...