Kawasaki disease, also known as cutaneous mucosal lymphatic syndrome, is most commonly seen in children, 80% of whom are under 5 years of age, and is more common in males. The main pathology is an inflammatory vascular lesion that causes coronary artery involvement with thinning of the vessel wall, aneurysmal changes, local dilatation or narrowing, or even occlusion. It causes myocardial infarction or ischemic cardiomyopathy, and may also present with pericarditis, myocarditis or valvulitis. Ultrasound examination takes a short-axis view of the aortic root and shows the beginning of the left and right coronary arteries respectively. When there is aneurysm formation, its inner diameter is usually above 3.5-4 mm, the wall is variable thin and the intima is not smooth. Other cardiac lesions may include intrapericardial effusion, left ventricular enlargement, decreased systolic function, and if there is an infarction, localized myocardial thinning and loss of motion. In the acute phase, there may be regurgitation of the mitral or tricuspid valve.