When Hindsight Is 20/20: Stiff Left Atrium Syndrome Masquerading as Mitral Regurgitation

Scarring from atrial ablation carries a risk of developing stiff left atrium syndrome, which can mimic mitral valve disease. We present a case of a 73-year-old man whose stiff left atrium syndrome came to light after percutaneous mitral valve repair. (Level of Difficulty: Intermediate.).