Anatomic classification of the mitral valve (Wilkins' score, Massachusetts General Hospital)
| Leaflet mobility |
| • Highly mobile valve with restriction of only the leaflet tips |
| • Mid portion and base of leaflets have reduced mobility |
| • Valve leaflets move forward in diastole mainly at the base |
| • No or minimal forward movement of the leaflets in diastole |
| Valvar thickening |
| • Leaflets near normal (4–5 mm) |
| • Mid leaflet thickening, pronounced thickening of the margins |
| • Thickening extends through the entire leaflets (5–8 mm) |
| • Pronounced thickening of all leaflet tissue (> 8–10 mm) |
| Subvalvar thickening |
| • Minimal thickening of chordal structures just below the valve |
| • Thickening of chordae extending up to one third of chordal length |
| • Thickening extending to the distal third of the chordae |
| • Extensive thickening and shortening of all chordae extending down to the papillary muscle |
| Valvar calcification |
| • A single area of increased echo brightness |
| • Scattered areas of brightness confined to leaflet margins |
| • Brightness extending into the mid portion of leaflets |
| • Extensive brightness through most of the leaflet tissue |