| from the pleural space | 3 | location |
| in order to avoid blood vessels | 2 | purpose |
| needle → be → aspirated | 11 |
| needle → be used to aspirate → fluid | 4 |
| negative | neutral | positive |
| 0.260 | 0.705 | 0.035 |
| Raw frequency | 15 |
| Normalized frequency | 0.249 |
| Modifier score | 0.500 |
| Perplexity | 173.686 |