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Histomicrophotograph of sections from gastric lesion (a), showing neuroendocrine tumor (H and E, ×100), on immunohistochemistry, tumor cells are positive for synaptophysin (b), chromogranin (c) with Ki-67 proliferative index less than 1% (d), suggesting well-differentiated neuroendocrine tumor (typical carcinoid, Grade 1). Lymph node biopsy reveals necrotizing epithelioid cell granulomatous inflammation with Langhans cell histiocytosis (e, f: black arrow)
