Pancreatitis, Acute Necrotizing; Patients; Image Processing, Computer-Assisted; From January 1996 to December 2000, at Viet Duc Hospital, 41 patients were undergone a CT scanning and at the end, an operation or an amylase quantitation with a threefold higher blood level. In most of cases CT scanner showed a size of threefold large than normal pancrea. However no larger size was found in the cases of necrotic of the periphery of the pancrea associated with peripheral infiltrated tissues, on CT image the peripheral infiltrated tisues, the dim borders, the rough parenclyma before and after injection of photocontrast agent are significant signs for diagnosing acute hemorrhagic necrotic pancreatitis