Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content ++|PrintIAAneurysm bulges continually to the right atriumIBAneurysm predominantly bulges to the right atrium but has a phasic oscillation into the left atrium during the cardiorespiratory cycleICAneurysm that oscillates between the right and left atrial chambers with each cardiac cycleIIAneurysm protruding exclusively into the left atrium ++|PrintClass 1No or minimal intimal thickening <3 mmClass 2Intimal layer thickness >3 mmClass 3Protruding atheroma <5 mmClass 4Protuding atheroma >5 mmClass 5Protuding atheroma >5 mm with a mobile fragment++ ++|PrintSmall<0.5 cmModerate0.5-2 cmLarge>2 cmNormal pericardial thickness:1 to 2 mm. ++1. Hanley PC, Tajik AJ, Hynes JK, et al. Diagnosis and classification of atrial septal aneurysm by two-dimensional echocardiography: report of 80 consecutive cases. J Am Coll Cardiol. 1985;6:1370-1382. [PubMed: 4067118] ++2. Katz ES, Tunick PA, Rusinek H, Ribakove G, Spencer FC, Kronzon I. Protruding aortic atheromas predict stroke in elderly patients undergoing cardiopulmonary bypass: experience with intraoperative transesophageal echocardiography. J Am Coll Cardiol. 1992;20:70-77. [PubMed: 1607541] Your Access profile is currently affiliated with [InstitutionA] and is in the process of switching affiliations to [InstitutionB]. Please select how you would like to proceed. Keep the current affiliation with [InstitutionA] and continue with the Access profile sign in process Switch affiliation to [InstitutionB] and continue with the Access profile sign in process Get Free Access Through Your Institution Learn how to see if your library subscribes to McGraw Hill Medical products. Subscribe: Institutional or Individual Sign In Error: Incorrect UserName or Password Username Error: Please enter User Name Password Error: Please enter Password Sign in Forgot Password? Forgot Username? Sign in via OpenAthens Sign in via Shibboleth You already have access! Please proceed to your institution's subscription. Create a free profile for additional features.