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An insulinoma is a rare pancreatic beta-cell tumor that hypersecretes insulin. The main symptom is fasting hypoglycemia. Diagnosis is by a 48- or 72-hour fast with measurement of glucose and insulin levels, followed by endoscopic ultrasound. Treatment is surgery when possible. Drugs that block insulin secretion (eg, diazoxide, octreotide, calcium channel blockers, beta-blockers, phenytoin) are used for patients not responding to surgery.
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