Stanford Type B dissection does not involve the ascending aorta. Which statement best reflects this?

Stanford Type B dissection does not involve the ascending aorta. Which statement best reflects this?

• A. Involves the Ascending Aorta
• B. Does Not Involve the Ascending Aorta
• C. Involves Only the Arch
• D. Involves Both Ascending and Descending

Answer: (B)

The key idea is where the dissection occurs along the aorta in the Stanford system. Type B dissections do not involve the ascending aorta; they originate distal to the left subclavian artery and affect the descending thoracic aorta (and may extend into the arch or beyond, but not the ascending portion). So the statement that it does not involve the ascending aorta is the correct reflection of Type B. In contrast, dissection that involves the ascending aorta is classified as Type A, which is why other options imply involvement of the ascending segment or mix in a way that isn’t characteristic of Type B.

The key idea is where the dissection occurs along the aorta in the Stanford system. Type B dissections do not involve the ascending aorta; they originate distal to the left subclavian artery and affect the descending thoracic aorta (and may extend into the arch or beyond, but not the ascending portion). So the statement that it does not involve the ascending aorta is the correct reflection of Type B. In contrast, dissection that involves the ascending aorta is classified as Type A, which is why other options imply involvement of the ascending segment or mix in a way that isn’t characteristic of Type B.