Figure 2: (a) Duodenal lesion cells immunohistochemistry showing strong cytoplasmic positivity for synaptophysin. (b) Duodenal lesion cells immunohistochemistry showing strong cytoplasmic positivity for chromogranin. (c) View on H and E staining of duodenal lesion suggestive of neuroendocrine tumor, ×40. (d) MIB 1 in 6% of tumor cell nuclei showing strong positivity