54. An atheroma (arrow) in the anterior descending artery (a branch of the left coronary artery). Note the reduced size of the lumen of the vessel as a result of the atheroma. From a 37-year-old man. Homicide was the cause of death.
55. Thrombus (arrow) in a branch of the left main coronary artery. Note the fatty deposits (yellow) that have thick-ened the arterial wall and reduced the size of the lumen. From a 45-year-old man who died of acute myocardial infarction.