The Evolution of Three-Dimensional Echocardiography: From the Initial Concept to Real-Time Imaging -- Physics and Technical Principles of Three-Dimensional Echocardiography -- Technical Principles of Transesophageal Three-Dimensional Echocardiography -- How to Implement Three-Dimensional Echocardiography in the Routine of the Echocardiography Laboratory -- Routine Assessment of the Left Ventricle -- Advanced Assessment of the Left Ventricle -- The Normal Mitral Valve -- Mitral Valve Congenital Abnormalities and Stenosis -- Degenerative Mitral Regurgitation -- Functional Mitral Regurgitation -- Assessment During and After Surgery or Interventional Procedures on the Mitral Valve -- The Normal Aortic Valve Complex -- Aortic Valve Congenital Abnormalities and Stenosis -- Aortic Regurgitation -- Assessment After Surgery or Interventional Procedures on the Aortic Valve -- Left Atrium -- Assessment of the Right Ventricle -- The Normal Tricuspid Valve -- Tricuspid Valve: Congenital Abnormalities and Stenosis -- Organic Tricuspid Regurgitation -- Functional Tricuspid Regurgitation -- Assessment After Surgery or Interventional Procedures on the Tricuspid Valve -- The Right Atrium -- The Role of 3DE in the Evaluation of Cardiac Masses -- X-Ray-Echo Fusion Imaging In Catheter-Based Structural Heart Disease Interventions.