Periampullary duodenal neuroendocrine tumor in a patient with neurofibromatosis-1: A case report

Figure 3 Microscopic findings of the pancreatic tumor. A: Histologic hematoxylin and eosin (HE) stain of the duodenal neuroendocrine tumor (NET) (magnification × 200); B and C: Expression of synaptophysin (B) and chromogranin A (C) were positive on immunohistochemical stain in the NET; D: Ki67 labeling index of the NET was 1%; E: Metastatic tumors in peripancreatic lymph nodes; F: HE stain of the stromal tumor in the serous surface of the duodenum; G and H: Expression of CD 117(G) and DOG-1 (H) were positive on immunohistochemical stain in the stromal tumor; I: HE stain of the cutaneous neurofibroma; J: Expression of S100 protein was positive in the neurofibroma (magnification × 200).