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| Diagnosis of pleural fluid | Number of cases (n) | Percentage of cases (%) |
| Malignant pleural effusion | 51 | 43.5 |
| Failure fluids* | 21 | 17.9 |
| Inflammation | 16 | 13.7 |
| Empyema | 13 | 11.1 |
| Parapneumonic pleural effusion | 6 | 5.1 |
| Tuberculous pleurisy | 4 | 3.5 |
| Paramalignant pleural effusion | 3 | 2.6 |
| Secondary to pulmonary thromboembolism | 3 | 2.6 |
| Total | 117 | 100 |
| * Congestive heart failure, kidney failure, liver failure. | ||
