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Insulinoma is the most common tumor of pancreatic endocrine cells. Recurring hypoglycemia in an otherwise healthy person is a typical indicator for this disease. Diagnosis is based on demonstrating hyperinsulinemia at the same time as blood sugar values are indicative of hypoglycemia. Afterwards, various imaging techniques are used to try to localize the tumor. Therapy for insulinoma is nearly always by surgical removal. After successful surgery, patients who had benign solitary insulinoma usually have no further problems. This article describes the case of a patient who sought medical help because of symptoms and signs of hypoglycemia. After the presence of hyperinsulinemia had been proven, imaging techniques showed an expansive lesion in the pancreas. The lesion was surgically removed. More than two years after surgery, the patient remains symptom-free.