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a Core of liver mass in a patient with multiple liver lesions, pancreas mass, and diarrhea. Histology shows trabecular architecture of uniform cells with pale-pink cytoplasm and round, eccentrically located nuclei, consistent with well-differentiated PNET. H&E. ×200. b Synaptophysin, diffusely and strongly positive in tumor cells (×200). c Chromogranin, apical positivity with moderate intensity (×200). d Ki-67 highlights proliferation index of 2%. H&E. ×200.
