A 16-Year Natural History of a Congenital Pseudoaneurysm of the Mitral-Aortic Intervalvular Fibrosa.

Pseudoaneurysm of the mitral aortic intervalvular fibrosa is a rare condition most often reported as sequela of endocarditis and surgical trauma, with congenital cases being very uncommon. This case describes a congenital pseudoaneurysm of the mitral aortic intervalvular fibrosa and stable 16-year natural history. (Level of Difficulty: Intermediate.).