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Incidental finding at CT coronary angiogram. Can you identify the abnormality?
Interatrial septal aneurysm
An interatrial septal aneurysm is noted with a saccular formation of the interatrial septum bulging into the left atrium. The aneurysm is protruding ~16 mm beyond the plane of the atrial septum. The diameter at the base of the aneurysm is ~ 27mm. There is no atrial septal defect or any obvious left to right shunt.