The following is/are true of a descending dissecting aortic aneurysm:

A. It originates distal to the subclavian artery.

B. It is usually found in hypertensive patients.

C. It may extend the entire length of the aorta.

DISCUSSION: Descending dissections are almost always seen in hypertensive patients. The diagnosis is made by locating the tear in the aorta distal to the left subclavian artery. Type III dissections may involve only the descending thoracic aorta but can extend the entire length of the aorta.