Abstract
A 56-year-old woman admitted to emergency for loss of consciousness had significant hyperglycemia and ketoacidosis and plasma glucose of 882mg/dl, total ketone body of 3795μmol/L, and arterial blood pH of 7.265. She had inflammation with an elevated total white blood count (WBC of 13000/mm3) and CRP of 16.4mg/dl, which was suspected to be the cause of ketoacidosis. Computed tomography (CT) of her left thigh 10 days after admission showed pyomyositis associated with abscesses. She was treated with intravenous antibiotic drugs and cured without any surgical intervention. Although pyomyositis is rare in nontropical countries, case reports of immunocompromised patients having it are increasing.Because diabetes mellitus may be a risk factor for pyomyositis, it is important to check for it when examining diabetic patients with localized muscle pain.