The pancreas is edematous, and peripancreatic fat stranding is evident, compatible with pancreatitis.
There is a smooth margin hyperattenuating mass-like lesion with surrounding hematoma near the gastric greater curvature, which maintains the intravenous contrast in delayed images. The diameter of the lesion is more than its related artery, so that's a pseudoaneurysm of the left gastroepiploic artery regarding enhancement pattern and anatomical location.
Moderate free abdominopelvic fluid due to hemorrhage.