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

Figure 3 Pathological smears of tumor tissue after various immunohistochemical staining. A: Hematoxylin and eosin (× 100); B: Chromogranin A (× 100); C: Gastrin (× 100); D: Ki-67 (× 100); E: Syn (× 100); F: Somatostatin receptors 2 (× 100). B and C suggest a gastrinoma; D represents proliferative activity; E and F suggests a neuroendocrine tumor.