A Stanford type B dissecting aneurysm primarily affects which part of the aorta?

A Stanford type B dissecting aneurysm specifically affects the descending aorta. This type of dissection originates after the left subclavian artery and continues down the length of the aorta. The dissection typically occurs in the thoracic region but is primarily characterized by involvement of the descending aorta, which distinguishes it from type A dissections that involve the ascending aorta as well.

Understanding the anatomy and implications of a type B dissection is crucial, as it informs the management and treatment options. Unlike type A, which is often considered a surgical emergency, type B dissections may be managed conservatively with medication unless complications arise, highlighting the importance of accurate identification of the affected aortic segment.