| become weak | 0.43 |
| get thicker | 0.36 |
| enclose internal region | 0.35 |
| lose their elasticity | 0.34 |
| consist of endothelium | 0.31 |
| occur with formation of… | 0.25 |
| seal shut | 0.25 |
| reduced in addition | 0.39 |
| thickened | 0.28 |
| trimmed | 0.25 |
| indicated by arrow | 0.25 |
| stretched | 0.16 |