A, Cardiac ultrasound (suprasternal long-axis view) of a 4-week-old boy; note increased echogenicity of the wall of the ascending aorta (arrow-heads). B, Radiograph of the left hand of a 2-week-old boy showing periarticular calcifications (arrow). C, Cross section of the left coronary artery from a boy who died of myocardial infarction at the age of 9 weeks, showing calcification at the level of the internal elastic lamina (arrows) and intimal proliferation (hematoxylin and eosin staining). Ao indicates aorta, LA; left atrium.