The arch of the aorta and the vessels arising from it are displayed at the front of the specimen. The arch shows fatty streaking and thickening. The right common carotid artery is blocked by a thrombus (commonly known as a "blood clot"), 2 cm in length, just above its origin. Thrombus is also adherent to the wall of the right external carotid artery, the calibre of which is considerably narrowed. The left common carotid artery is mildly atheromatous and exhibits a small area where thrombus is deposited, but this is not obstructing blood flow.