<prompt> Most common cause of dissecting hematoma isHypeensionMarfans syndromeIatrogenicKawasaki  <response>: Aoic dissection occurs when blood splays apa the laminar planes of the media to form a blood-filled channel within the aoic wall.Aoic dissection occurs mainly in two age groups: 1men aged 40 to 60 with antecedent hypeension more than 90 of cases; and 2 younger patients with connective tissue abnormalities that affect the aoa.Robbins Basic pathology, 9th edition, pg no.346 