A 22-year-old Malay man with recurrent hypoglycaemic fainting spells was found to have hyperinsulinism. Although the CT scan of the abdomen and arteriogram failed to demonstrate any tumour in the pancreas, three tumours were found in the body of the pancreas at laporatomy, An appraisal of the techinques currently available for diagnosis and localisation of insulinoma is presented.
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