results did not differ for patients with or without men-i , depend on the extent of the gastrinoma ( duodenal versus pancreatic gastrinomas ) , the presence of previous gastric surgery or type of gastric surgery , or for patients with fasting serum gastrin concentrations greater than or equal to 1,000 pg/ml or less than 1,000 pg/ml . studies of four patients before and after resection of the gastrinoma , who prior to surgery had a greater than 100 % increase in gastrin secretion after the meal , demonstrated that all patients had a less than 100 % increase postoperatively even though no gastric resection was done .
C0038351
gastric
C0017118
gastric resection