Left atrial appendage aneurysm secondary to eccentric severe ischemic mitral regurgitation.

Dilatation primarily confined to the left atrial appendage (LAA) is an unusual condition in nonrheumatic mitral valve disease. We report a case of 56-year-old male with a giant LAA secondary to ischemic severe mitral regurgitation without significant dilatation of the left atrial main chamber. The mitral regurgitation jet was directed toward the LAA, which we thought as the cause of disproportionate LAA enlargement.