<prompt> The most common site of acute aoic dissection isRight lateral wall of ascending aoaArch of aoaSuprarenal abdominal aoaInfrarenal abdominal aoa  <response>: This occurs when a defect or flap occurs in the intima of the aoa, resulting in blood tracking into the aoic tissues splitting the medial layer and creating a false lumen. It most commonly occurs in the ascending aoa or, less often, just distal to left subclan ae. Reference: Bailey and love, 27th edition, page no. 909 