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Definition of the PEF score for each hemithorax.
| 0 | No PEF visible |
| 1 | PEF only visible in the CPA |
| 2 | PEF extends over the CPA without a clear separation of the lung base from the diaphragm |
| 3 | Clear separation between diaphragm and lung base at any point during the respiratory cycle |
| 4 | PEF occupies more than 50% of the basal pleural cavity visible in the standardised imaging plane |
PEF: pleural effusion; CPA: costophrenic angle.
