gastrointestinal disorders
Insulinoma
Key Points
Only about 10% of insulinomas are malignant, but all cause fasting hypoglycemia. Glucose andinsulinlevels are measured during symptoms (either spontaneous or induced by fasting during hospitalization). Endoscopic ultrasonography has>90% sensitivity for locating the tumor; positron emission tomography (PET) also may be used, but CT is not useful. About 90% of insulinomas can be resected surgically. Control symptoms of hypoglycemia withdiazoxideor sometimesoctreotide. 