“…The original aortic damage might be due to methysergide or other vasoactive agents in some cases, and to aortitis similar to that seen in connective tissue diseases in the majority. Some of the cases in the series have already been reported (Jones and Alexander, 1966;Turner-Warwick, Nabarro, and Doniach, 1966;Jose, 1967); to these authors, and to other surgeons, physicians, and pathologists too numerous to name, my thanks are due for permission to study their patients. I am grateful to the Department of Medical Photography, Addenbrooke's Hospital, for Figures 1 and 4-7.…”