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% |