Dissecting aorta, light micrograph

Dissecting aorta, light micrograph

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Caption: Dissecting aorta. Light micrograph showing a dissecting aorta, a type of aneurysm where the layers of the wall of the artery have split (dissected, top). The aorta's inner wall (tunica intima) is at left. A laceration in this wall (not seen here) has caused blood to pool in the artery's middle layer (tunica media), forming a haematoma (red wedge at top). The aorta is the body's main artery, carrying blood from the heart to the rest of the body. An aneurysm is a blood-filled dilation in a blood vessel caused by a weakened vessel wall. If it ruptures through the outer layer of the artery wall (tunica adventitia, pale pink at right), it will be fatal. Treatment of the aneurysm is by repairing or replacing the weakened vessel.

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