Anatomic classification of the mitral valve (Cormier's score, Tenon and Bichat Hospitals, Paris)
| Echocardiographic group | Mitral valve anatomy |
| Group 1 | Pliable non-calcified anterior mitral leaflet and mild subvalvar disease—that is, thin chordae ⩾ 10 mm long |
| Group 2 | Pliable non-calcified anterior mitral leaflet and severe subvalvar disease—that is, thickened chordae < 10 mm long |
| Group 3 | Calcification of mitral valve of any extent, as assessed by fluoroscopy, whatever the subvalvar apparatus |