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Division of Cardiology, New York Presbyterian Hospital-Columbia University Medical Center, New York, NY, USA; Division of Cardiothoracic Surgery, New York Presbyterian Hospital-Columbia University Medical Center, New York, NY, USA Correspondence to: Isaac George, MD. Division of Cardiothoracic Surgery, New York Presbyterian Hospital-Columbia University Medical Center, 177 Fort Washington Avenue, 7 Garden North – Room 435, New York, NY 10032, USA. Email: ig2006@cumc.columbia.edu.

Direct transcatheter mitral valve implantation in severe mitral annular calcification: technique and evidence