Does an Absent Left Main Lead to a Main Event?

This is a case report of a 29-year-old, male applicant for life insurance who was discovered to have an absence of the left main coronary artery (LMCA), with the left anterior descending coronary artery (LAD) and left circumflex coronary artery (LCX) each arising directly from the left sinus of Valsalva. A brief review of several types of coronary artery anatomic variants will be presented.