A 50-year-old man has had pain in the left shoulder and arm for the past 12 hours. Over the next 6 hours, he develops shortness of breath, which persists for 2 days. The patient is admitted to the hospital and continues to experience dyspnea for the next 3 days. Coronary angiography shows 50% proximal occlusion of the right coronary and circumflex arteries, and 75% occlusion of the left anterior descending artery. On day 7 after the onset of shoulder pain, he has a cardiac arrest. Which of the following atherosclerosis plaque alterations is associated with the patient’s death?