- For patients at least six months of age, at least three principal criteria. 2. Meeting Japanese Ministry of Health criteria for coronary aneurysm defined as an internal lumen diameter of >3 mm in children less than 5 years of age or >4 mm in children 5 years of age and older, in either the proximal right coronary artery or the proximal left anterior descending coronary artery and at least one principal criterion.