<prompt> All are true about Zollinger Ellison syndrome except -Surgery is doneExocrine tumourEndocrine disorderSecretory diarrhoea  <response>: Zollinger Ellison syndrome is a rare disorder characterised by the triad of severe peptic ulceration, gastric acid hypersecretion and a neuro-endocrine tumour p. 678 of the pancreas or duodenum gastrinoma. It probably accounts for about 0.1 of all cases of duodenal ulceration. The syndrome occurs in either sex at any age, although it is most common between 30 and 50 years of age Ref Harrison 20th edition pg 667 