Table 3 CT Severity Index (Modified from: Balthazar EJ, Robinson DL, Megibow AJ, Ranson JH. Acute pancreatitis: value of CT in establishing prognosis. Radiology. 1990; 174:331–6 [27])
From: 2019 WSES guidelines for the management of severe acute pancreatitis
| CT grade | Grade score | Definition |
| A | 0 | Normal pancreas |
| B | 1 | Pancreatic enlargement |
| C | 2 | Pancreatic inflammation and/or peripancreatic fat |
| D | 3 | Single peripancreatic fluid collection |
| E | 4 | ≥ 2 fluid collections and/or retroperitoneal air |
| % of necrosis | Necrosis score | Definition |
| None | 0 | Uniform pancreatic enhancement |
| < 30% | 2 | Non-enhancement of region(s) of gland equivalent in size of pancreatic head |
| 30–50% | 4 | Non-enhancement of 30–50% of the gland |
| > 50% | 6 | Non-enhancement of over 50% of the gland |
| CT Severity Index | Morbidity | Mortality |
| 0–1 | 0 | 0 |
| 2–3 | 8% | 3% |
| 4–6 | 35% | 6% |
| 7–10 | 92% | 17% |