Macroscopic grading score of the symphysis
| Grade | Pleurodesis |
| 0 | Normal pleural space and lung |
| 1 | No adhesion but pleural space inflamed as evidenced by redness and fibrin deposition |
| 2 | Few scattered adhesions |
| 3 | Generalised scattered adhesions |
| 4 | Complete obliteration of the pleural space by adhesions |