Pseudocyst: 61 years old man, with history of alcohol abuse and hospitalized for necrotizing pancreatitis. Contrast-enhanced CT scan after 4 weeks from the onset, show a hyperdense collection in the retroperitoneum, behind the head of the pancreas and the duodenum (arrow head) suggesting previous bleeding. No signs of active bleeding were evident. Other pseudocysts are localized in the peri-pancreatic fat, between body and tail (empty arrows). Wirsung duct is also dilated (thin arrow)