Congenital aneurysm of the left atrium: diagnosis and management.

A case of congenital aneurysm of the left atrial appendage is presented and previously reported cases are reviewed. The diagnosis can be strongly suspected with the combination of an unusually prominent left heart border in the chest X-ray and two-dimensional echocardiographic findings of a large echo-free space close to the left atrium. The site of communication must be defined accurately and cardiac catheterisation and angiocardiography should be performed. Once the diagnosis is confirmed, surgery is indicated even in the asymptomatic patient because of the risk of systemic embolism.