Initial experience with removal of protruding atheroma from aortic arch: diagnosis by transesophageal echo, operative technique and follow-up. - Culliford,A.T.; Tunick,P.A.; Katz,E.S.; Kronzon,I.; Galloway,A.C.; Ribakove,E.S.; Esposito,R.A.; Spencer,F.C. (J Am Coll Cardiol, 1993)