All the following are causes of acute pancreatitis except-

Causes of Acute Pancreatitis Common Causes Gallstones (including microlithiasis) - most common Hypertriglyceridemia Endoscopic retrograde cholangiopancreatography (ERCP), especially after biliary manometry. Trauma (especially blunt abdominal trauma) Postoperative (abdominal and nonabdominal operation) Drugs ( L-asparaginase, thiazide diuretics, furosemide, estrogens, azathioprine, 6-mercaptopurine, methyldopa. sulfonamide, tetracycline, valproic acid, anti-HIV medications) Sphincter of Oddi dysfunction Uncommon causes Vascular causes and vasculitis (ischemic-hypoperfusion states after cardiac surgery) Connective tissue disorders and thrombotic thrombocytopenic purpura (TTP) Cancer of the pancreas Hypercalcemia Periampullary diverticulum Pancreas divisum Hereditary pancreatitis Cystic fibrosis Renal failure Rare causes Infections (mumps, coxsackievirus, cytomegalovirus, echovirus, parasites). Autoimmune (i.e., Sjogren's syndrome) Causes to consider in patients with recurrent bouts of acute pancreatitis without an obvious etiology Occult disease of the biliary tree or pancreatic ducts, especially microlithiasis, sludge Drugs Pancreatic cancer Idiopathic Hypertriglyceridemia Sphincter of Oddi dysfunction Pancreas divisum Cystic fibrosis