Atrial septal aneurysm
Incidentally found on a Cardiac CT for evaluation of the coronary arteries.
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There is a saccular outpouching of the interatrial septum from the left atrium into the right atrium. It measures 11 mm off the midline, with a 13 mm base.
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A small outpouching of the interatrial septum at the fossa ovalis is common.
When the outpouching is termed "aneurysmal," however, varies according to the source with a range of 11-15 mm.
Atrial septal aneurysms have been associated patent foramen ovale and with an increased incidence of thromboembolic events.
- Halpern EJ (ed). Clinical Cardiac CT: Anatomy and Function. Chap 9. pp 183-185.
- Recurrent Cerebrovascular Events Associated with Patent Foramen Ovale, Atrial Septal Aneurysm, or Both Jean-Louis Mas, M.D., Caroline Arquizan, M.D., Catherine Lamy, et al. Patent Foramen Ovale and Atrial Septal Aneurysm Study Group N Engl J Med 2001; 34