A 55-year-old man with abdominal pain and fever after drinking alcohol was found in blood chemistry examination to have elevated serum amylase (1,071 IU/
l, normal range 40-125 IU/
l) and in computed tomography (CT) to have pancreatic swelling. Blood glucose on admission for a diagnosis of acute pancreatitis was 107 mg/d
l. Abdominal pain, fever, and elevated serum amylase lessened under conservative therapy on hospital day 4. On hospital day 6, however, he suddenly developed diabetic ketoacidosis, which was improved by insulin treatment. Pancreatic swelling was not detected in CT on hospital day 10. Urine C-peptide was <0.1 μg/day and serum C-peptide <0.1 ng/m
l both before and 6 min after glucagon (1 mg) loading. Autoantibodies to glutamic acid decarboxylase and insulinoma-associated protein 2 were negative. He was diagnosed with fulminant type 1 diabetes mellitus based on rapid insulin secretion depletion. Clinical features diagnosed with acute pancreatitis were consistent with preceding symptoms of fulminant type 1 diabetes mellitus. We summarize cases in which pancreatic swelling was detected prior to ketoacidosis in fulminant type 1 diabetes mellitus.
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