Computed tomography (CT) grading of severity
| Modified from the World Association guidelines3 and based on Balthazar and colleagues.26 | |
| CT grade | |
| (A) Normal pancreas | 0 |
| (B) Oedematous pancreatitis | 1 |
| (C) B plus mild extrapancreatic changes | 2 |
| (D) Severe extrapancreatic changes including one fluid collection | 3 |
| (E) Multiple or extensive extrapancreatic collections | 4 |
| Necrosis | |
| None | 0 |
| <One third | 2 |
| >One third, <one half | 4 |
| >Half | 6 |
| CT severity index = CT grade+necrosis score | |
| Complications | |
| 0–3 | 8% |
| 4–6 | 35% |
| 7–10 | 92% |
| Deaths | |
| 0–3 | 3% |
| 4–6 | 6% |
| 7–10 | 17% |