Figure 2a. (a) Schematic of aortic layers in typical aortic dissection shows a tear of the intimal layer, which has resulted in the formation of two lumina (one false, one true). (b) Photograph of an autopsy specimen shows a Stanford type B aortic dissection. An intimal tear (arrows) and intimal calcifications (arrowheads) are clearly visible in the descending aorta.