| Feature code | Feature name |
| *ACI1 | Average of convergence index 1 |
| *ACI2 | Average of convergence index 2 |
| *ACI3 | Average of convergence index 3 |
| *NumCorners | The number of corners |
| *RatioPMPC | Ratio of perimeter of segmented mass to that of a circle with the same area |
| D/W | Depth-width ratio |
| IndisMargin | Degree of indistinctness along the margin |
| HomoEchoes | Homogeneity in internal echoes |
| InEchoes | Echo level of internal echoes |
| PostEchoes | Echo level of posterior echoes |
| Circularity | Circularity measure in mass shape |
| Polygon | Polygon measure in mass shape |
| Lobulated | Lobulated shape measure in mass shape |
| Irregularity | Irregularity measure in mass shape |