Primary hepatic neuroendocrine tumor — 18F-fluorodeoxyglucose positron emission tomography/computed tomography findings: A case report

Figure 3 Pathological findings. A: Hematoxylin and eosin-stained sections (× 200 magnification) demonstrate a well-differentiated neoplasm with the trabecular and glandular architectural pattern; B: The Ki-67 proliferation index (× 100 magnification) is 15% in tumor cells; C-F: Immunohistochemical staining (× 100 magnification) reveals positive immunoreactivities for CD56 (C), cytokeratin AE1/AE3 (D), synaptophysin (E), and negative immunoreactivity for chromogranin A (F), respectively.