Horner's syndrome in a patient presenting with chest pain.

An altered mental status and peripheral nerve dysfunction are alarming signs in a patient presenting with chest pain. If complicated by acute myocardial infarction, this raises the suspicion of aortic dissection and warrants immediate CT angiography. We report a dramatic case of chest pain in a 79-year-old man with somnolence and Horner's syndrome, subsequently complicated by myocardial infarction. Autopsy demonstrated a type A aortic dissection involving the carotid arteries and the right coronary artery.