Interstitial edematous pancreatitis is characterized by a relatively homogenous enhancement of the pancreatic parenchyma with inflammatory fat stranding. Acute fluid collections occur in the early set of acute pancreatitis without a definitive wall. Pancreatic necrosis is identified when diffuse or focal areas of the pancreas fail to enhance and are subdivided into three categories: pancreatic, peripancreatic, or combined (mostly). A pseudocyst is a peripancreatic fluid collection encapsulated by a wall that persists for more than four weeks in cases of interstitial pancreatitis. Walled-off necrosis is characterized by encapsulated collections that develop after four weeks of necrotic collections. Acute pancreatitis can lead to vascular complications, mainly pseudoaneurysms of the splenic artery or thrombosis of the splenic vessels.