Figure 105h_ab

The major anatomic variations of aortic dissection as they appear on aortography.
A. The dissection originates in the ascending aorta, as in the left panel in the diagram (Fig. 105g). Note the proximity of the false channel to the right coronary artery as well as the aortic regurgitation that results from loss of support of the valve.
B. The dissection begins distal to the left subdavian artery, as in the center panel of the diagram. The laterally placed false channel is less well opacified than the true lumen.

(From Lindsay J Jr. Aortic dissection. Heart Dis Stroke 1992; 1:69. Reproduced with permission from the publisher and author.)