| surround the heart | 0.68 |
| consist of two sacs | 0.55 |
| protect the heart | 0.55 |
| consist of two layers | 0.47 |
| become stiff | 0.40 |
| become inflamed | 0.37 |
| give protection | 0.28 |
| provide the lubrication | 0.28 |
| become swollen | 0.28 |
| prevent the heart | 0.27 |
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| the sac | 0.45 |
| the membrane | 0.40 |
| fibroserous sac | 0.33 |
| membranous sac | 0.28 |
| opened | 0.55 |
| removed | 0.35 |
| incised | 0.35 |
| thickened | 0.28 |
| dissected | 0.28 |
| entered | 0.25 |
| expanded beyond resting… | 0.25 |
| accessed through the pa… | 0.25 |
| reconstructed with a go… | 0.25 |
| selected | 0.25 |
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