Machine learning and radiomics for differentiating severe from moderately severe acute necrotizing pancreatitis on contrast-enhanced computed tomography

Figure 3 Peripancreatic necrosis only. A: Schematic of peripancreatic necrosis only: Fatty debris in peripancreatic adipose tissue without necrosis of the pancreatic parenchyma; B: Portal venous phase contrast-enhanced computed tomography in a 43-year-old male with peripancreatic necrosis only reveals peripancreatic necrotic collections (white arrows) containing scattered fatty debris (black arrowheads). Normal pancreatic parenchyma is indicated by a white star; C: Corresponding manually delineated regions of interest: Pancreatic parenchyma (green) and peripancreatic necrotic collections (yellow). P: Pancreas; FD: Fatty debris; ANC: Acute necrotizing collection.