A 29-year-old man with a history of alcohol misuse presented with acute abdominal pain, vomiting, and a tense and tender abdomen. Serum amylase and lipase levels were elevated, and acute pancreatitis was diagnosed. Computed tomography revealed a bilateral renal halo sign (Figure) and oedema of the pancreas with multiple fluid collections. The halo appears as ground-glass attenuation on imaging, due to enhancement of the perirenal fat from the retroperitoneal collection of pancreatic exudates.1 Bilateral perirenal fluid collections are rare2 and suggest pancreatitis.1