Background: Fulminant type 1 diabetes mellitus (FT1D) is a newly established subtype of type 1 diabetes. Its\netiology has not been fully elucidated. Several cases with FT1D have exhibited pancreatitis or myocarditis.\nCase presentation: We report a 31-year-old Japanese woman who showed upper abdominal pain and was\nadmitted to a local hospital. She was initially diagnosed with acute pancreatitis based on serum amylase elevation\nand swelling of the pancreas on computed tomography. Four days after admission, she developed diabetic\nketoacidosis and was transferred to our hospital. Her symptoms and laboratory findings met the FT1D criteria. On\nthe 3rd hospital day, electrocardiography (ECG) showed ST-segment elevation, and serum cardiac enzymes were\nmarkedly elevated. Because she exhibited late gadolinium enhancement in the apical wall on contrast-enhanced\ncardiac magnetic resonance imaging, she was diagnosed as acute myocarditis. Abnormal ECG findings and\nelevations of biomarkers associated with myocarditis showed improvement on the next day.\nConclusions: This is the first case of FT1D accompanied by both pancreatitis and myocarditis and suggests that the\npathophysiology of FT1D is related to the common etiology of acute pancreatitis and myocarditis.
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