In @entity1 with @entity751 , preoperative localization of the @entity9608 highly contributes to surgical removal. When the ultrasonography, computed tomography, magnetic resonance and pancreatic angiography fail to visualize the @entity5 , they are @entity9608 ( @entity9608 ). In this paper we describe the results of a new diagnostic method to localize @entity9608 , performed in 5 @entity1 with @entity3190 . In four out of five @entity1 , computed tomography, magnetic resonance and angiography failed to show any @entity5 . In just one single case, these imaging methods showed the @entity788 . All @entity1 were studied by @entity788 ( @entity788 ): a) infusion of @entity10041 (0.025 mEq/kg) in each artery that supplies the pancreas: gastroduodenal, superior mesenteric and splenic arteries as well as the hepatic artery; b) insulin venous sampling in the right supra-hepatic vein at 30 and 60 seconds after arterial stimulation (in one @entity1 an additional sample at 90 seconds was obtained). The study was considered pathologic when the gradient (basal vs post-stimulus) increased at least 100%. RESULTS: In all five @entity1 a pathological gradient was found. The suspected preoperative localization of the @entity5 was confirmed at surgery in four cases. The anatomopathologic examination revealed @entity9608 in four cases and @entity5 in the remaining. It is concluded that the results of this preliminary experience show the usefulness of @entity788 in the preoperative localization of @entity9608 .

[A new methodology for the preoperative localization of XXXX ].

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity788 :: ('MESH:D010190', 'Disease') :: ['selective intraarterial pancreatic stimulation', 'SIPS', 'pancreatic tumor'] @entity9608 :: ('MESH:D007340', 'Disease') :: ['called occult insulinomas', 'insulinoma', 'occult insulinomas', 'OI'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'malignant insulinoma'] @entity3190 :: ('MESH:D006946', 'Disease') :: ['hypoglycemic syndrome secondary to endogenous hyperinsulinism'] @entity751 :: ('MESH:D013577', 'Disease') :: ['hypoglycemic syndrome'] @entity10041 :: ('MESH:D002125', 'Chemical') :: ['calcium gluconate']
@entity9608 :: (MESH:D007340,Disease) :: ['occult insulinomas']
