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Hammar´s diagram classifying visceral pleura involvement
| PX | Tumours situated within the lung parenchyma with no relationship to the pleura. |
| PL0 | Tumours with no pleural involvement or that reach the visceral pleura but do not extend beyond its elastic layer. |
| PL1 | Tumours that extend beyond the elastic layer of the visceral pleura but are not exposed on the pleural surface |
| PL2 | Tumours that are exposed on the pleural surface but do not involve the parietal pleura |
