Figure 1. Transradial engagement of the coronary arteries, representing the left and right coronary circuits, respectively. (a) is significant for an otherwise patent left main coronary artery. The mid-portion of the left anterior descending artery, as illustrated by the blue arrow, highlights the segment that is concerning for coronary artery dissection. Similarly, (b) represents the right coronary circuit with a red arrow highlighting the mid/distal PDA with signs suggestive of SCAD. SCAD: spontaneous coronary artery dissection; PDA: posterior descending artery.