<prompt> The most common site of acute aoic dissection is:-Right lateral wall of ascending aoaArch of aoaSuprarenal abdominal aoaInfrarenal abdominal aoa  <response>: AOIC DISSECTION Aoic dissection is caused by circumferential or, less frequently, transverse tear of the intima. MC site: Right lateral wall of the ascending aoa Another common site: Descending thoracic aoa just below the ligamentum aeriosum. Peak incidence: 6th and 7th decades. 