A 39-year-old male presents with acute epigastric pain radiating to the back. Serum amylase is markedly elevated. CT of the abdomen performed 72 hours after symptom onset reveals pancreatic oedema, peripancreatic fat stranding, and several fluid collections around the pancreas. There are several regions of the pancreas that do not enhance on a portal venous phase CT. No vascular complications are noted.

What is the most appropriate term to describe the fluid collections?