A 40-year old lady presented to the emergency room with a 12-hour history of severe left flank pain radiating downwards and backwards. She was tender in the left flank and hypochondrium. Her urine examination showed microscopic hematuria. An initial diagnosis of left ureteric colic was made. However, UHCT showed an inflamed pancreatic tail (Arrow). A raised amylase and lipase confirmed the diagnosis of acute pancreatitis.