scad in acute coronary syndrome patients may be between 2-4%. history scad was first described in the year 1931, at postmortem examination, in a 42-year-old woman. due to a lack of recognition and diagnostic technology though, scad literature until the 21st century included only case reports and series. with the recent advent of coronary angiography and intracoronary imaging, recognition and diagnosis of scad has greatly increased, especially in the 2010s.