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a Small intestinal mucosa depicting nodules in between the crypts (arrows) (hematoxylin and eosin, original magnification ×100). b Higher magnification revealing the nodules composed of round cells with amphophilic cytoplasm (hematoxylin and eosin, original magnification ×400). c, d Chromogranin A and synaptophysin, respectively, highlighting the neoplastic cells as well as non-neoplastic neuroendocrine cells within the glands (original magnification ×200).
