Figure 4: Coronary section from the proximal right coronary artery in a 50 year-old woman who died sudden cardiac death in-hospital. Luminal stenosis estimated to be 80%. Narrow black arrows = Dense foci of adventitial lymphocytes, suggesting this segment is the site of active, progressive disease. Fat black arrow = Tiny focus of intimal calcification. Note no evidence of lymphocytes within the atheroma. ATH = Atheroma. White asterisk = Injection mass in lumen.