Typical Zollinger-Ellison syndrome-atypical location of gastrinoma and absence of hypergastrinemia: A case report and review of literature

Figure 1 Endoscopic and histological findings. A and B: Esophagogastroduodenoscopy demonstrated multiple deep and superficial ulcers in the second and third portions of the duodenum (A), characteristic of the Zollinger–Ellison syndrome and alleviate duodenal ulcers after 3 wk of proton pump inhibitor (PPI) treatment (B; pentagram); C and D: Esophagogastroduodenoscopy biopsy revealed extensive neutrophil infiltration before PPI treatment (C) and a small amount of neutrophil infiltration noted after PPI treatment (D), which is suggestive of duodenitis.